Water COD (Chemical Oxygen Demand) Analyzer Market Size, Share, Growth, and Industry Analysis, By Type (Portable COD Analyzers, Benchtop COD Analyzers, Online COD Analyzers), By Application (Industrial and Municipal Wastewater, Ground/Surface Water, Drinking Water, Seawater, Others), Regional Insights and Forecast to 2035

Water COD (Chemical Oxygen Demand) Analyzer Market Overview

Water COD (Chemical Oxygen Demand) Analyzer Market size, valued at USD 365.03 million in 2026, is expected to climb to USD 695.59 million by 2035 at a CAGR of 7.43%.

The Water COD (Chemical Oxygen Demand) Analyzer Market is experiencing strong industrial demand due to the increasing need for wastewater monitoring, environmental compliance, and industrial process optimization across manufacturing, municipal, pharmaceutical, food processing, and chemical sectors. Water COD analyzers are widely used to measure the oxygen equivalent of organic pollutants in water samples, supporting accurate water quality assessment. More than 72% of industrial wastewater treatment facilities globally now utilize automated COD monitoring systems to improve treatment efficiency and reduce contamination levels. Approximately 68% of municipalities have upgraded laboratory infrastructure with digital water analysis technologies to meet stricter discharge regulations. The adoption of online COD analyzers has increased by over 61% in industrial monitoring operations because of real-time data tracking and reduced manual intervention. Demand for portable analyzers has also increased by 47% due to field testing requirements in remote locations. Growing investments in smart water infrastructure, industrial automation, and environmental sustainability programs continue to support Water COD (Chemical Oxygen Demand) Analyzer Market growth worldwide.

The United States represents a major contributor to the Water COD (Chemical Oxygen Demand) Analyzer Market due to strict environmental regulations and large-scale wastewater treatment infrastructure. More than 81% of industrial wastewater facilities across the country conduct routine COD monitoring to comply with federal discharge standards. Around 74% of municipal treatment plants utilize automated water quality monitoring systems integrated with digital analyzers. Demand from the pharmaceutical and food processing industries has increased by nearly 58% because of rising compliance requirements for organic pollutant control. Over 63% of environmental laboratories in the United States now prefer benchtop and online COD analyzers equipped with digital connectivity and automated calibration functions. Portable analyzers are also witnessing strong adoption in environmental inspection activities, with field-based water testing operations increasing by approximately 46% across industrial and municipal sectors.

Download FREE Sample to learn more about this report.

Key Findings

• Key Market Driver: More than 78% of wastewater treatment facilities increased deployment of automated COD analyzers, while industrial compliance monitoring activities expanded by 64% due to stricter environmental discharge standards and rising industrial wastewater generation levels.
• Major Market Restraint: Approximately 52% of small-scale industries reported high maintenance and calibration costs, while nearly 47% faced operational complexity issues associated with advanced online Water COD analyzer systems.
• Emerging Trends: Around 69% of newly installed systems feature IoT-enabled monitoring capabilities, while AI-assisted water quality analytics adoption increased by nearly 55% across industrial wastewater treatment applications.
• Regional Leadership: Asia-Pacific accounts for over 43% of industrial wastewater monitoring installations, while North America contributes nearly 31% of advanced digital COD analyzer deployment across municipal treatment facilities.
• Competitive Landscape: More than 58% of manufacturers are investing in smart analyzer technologies, while approximately 49% focus on portable monitoring equipment and automated sensor-based COD testing solutions.
• Market Segmentation: Online COD analyzers contribute approximately 46% of total installations, portable analyzers represent nearly 29%, and benchtop systems account for around 25% across industrial and laboratory operations.
• Recent Development: Nearly 62% of new product launches include remote monitoring features, while 57% of recently developed analyzers support cloud-based data integration and automated calibration technologies.

Water COD (Chemical Oxygen Demand) Analyzer Market Latest Trends

The Water COD (Chemical Oxygen Demand) Analyzer Market is witnessing significant technological transformation driven by industrial automation and digital water quality management systems. Around 71% of industrial facilities are shifting toward online COD analyzers equipped with remote monitoring and cloud integration features. Smart wastewater management systems have increased deployment of IoT-enabled analyzers by approximately 67% across municipal and industrial applications. Portable COD analyzers are becoming increasingly popular for field testing operations, with adoption rates increasing by nearly 49% due to environmental inspection requirements and rapid contamination analysis needs. Demand for compact benchtop analyzers has increased by 44% among research laboratories and educational institutions because of enhanced accuracy and lower reagent consumption.

Industries are also focusing on energy-efficient and low-maintenance analyzer technologies. Approximately 59% of manufacturers now integrate automated cleaning systems and self-calibration functions to reduce manual intervention. Environmental sustainability initiatives have accelerated the replacement of traditional testing methods with automated digital analyzers in over 63% of wastewater treatment facilities. Integration of artificial intelligence and predictive maintenance software has increased by 41%, helping operators improve process efficiency and reduce downtime. Multi-parameter analyzers capable of monitoring COD, BOD, TOC, and pH simultaneously are also gaining traction, with deployment rates increasing by more than 53% in industrial wastewater treatment plants.

Water COD (Chemical Oxygen Demand) Analyzer Market Dynamics

DRIVER

"Increasing demand for industrial wastewater monitoring"

The increasing focus on industrial wastewater management is one of the primary growth drivers for the Water COD (Chemical Oxygen Demand) Analyzer Market. More than 76% of manufacturing industries globally have implemented advanced wastewater monitoring systems to comply with stricter environmental discharge regulations. Industrial sectors including chemicals, pharmaceuticals, food processing, pulp and paper, and petrochemicals generate large quantities of organic wastewater, increasing the need for accurate COD measurement technologies. Approximately 69% of wastewater treatment plants now rely on automated COD analyzers to optimize treatment efficiency and maintain environmental compliance. Online analyzer adoption has expanded by nearly 64% because industries seek real-time monitoring and reduced laboratory dependency.

Municipal wastewater treatment activities have also increased substantially, with over 58% of urban infrastructure projects integrating automated water quality analysis systems. Smart city initiatives and sustainable water reuse programs are further supporting market expansion. Portable COD analyzers have witnessed a 46% rise in demand due to growing field inspection activities conducted by environmental agencies. In addition, around 61% of industries are investing in digital water quality solutions integrated with cloud-based monitoring platforms for centralized data analysis and operational transparency. These factors continue to strengthen the Water COD (Chemical Oxygen Demand) Analyzer Market Outlook across industrial and municipal sectors.

RESTRAINTS

"High maintenance and operational complexity"

High maintenance requirements and operational complexity remain major restraints affecting the Water COD (Chemical Oxygen Demand) Analyzer Market. Approximately 54% of small and medium-sized industries report difficulties associated with routine analyzer calibration, reagent handling, and sensor maintenance. Online COD analyzers require periodic cleaning and technical supervision, increasing operational burdens for facilities with limited technical expertise. Nearly 49% of wastewater treatment operators indicate that maintenance downtime negatively affects process continuity and monitoring accuracy.

Advanced analyzer systems also involve higher installation complexity due to integration with existing wastewater management infrastructure. Around 43% of industrial facilities face compatibility challenges while upgrading from traditional laboratory testing methods to automated digital systems. Reagent consumption and disposal management further add to operational difficulties, especially in industries with continuous monitoring requirements. Portable analyzers also face limitations in battery life and sensor durability under extreme environmental conditions, impacting approximately 38% of field monitoring activities.

In addition, the shortage of trained personnel capable of operating sophisticated digital analyzers continues to restrict broader adoption in developing regions. Nearly 45% of water treatment facilities report workforce skill gaps associated with advanced analyzer operation and maintenance procedures. These factors collectively limit rapid market penetration despite increasing demand for wastewater monitoring technologies.

OPPORTUNITY

"Expansion of smart water infrastructure projects"

The rapid expansion of smart water infrastructure projects presents substantial opportunities for the Water COD (Chemical Oxygen Demand) Analyzer Market. More than 67% of urban water management projects worldwide are integrating intelligent monitoring systems for wastewater treatment optimization and environmental compliance. Governments and municipal authorities are increasingly investing in digital water quality monitoring technologies to reduce water pollution and improve treatment efficiency. Approximately 62% of smart wastewater treatment facilities now deploy real-time COD monitoring systems connected through cloud-based platforms.

Industrial digitalization initiatives are also supporting the integration of AI-enabled analyzer systems capable of predictive maintenance and automated process control. Around 57% of industrial facilities are adopting IoT-connected analyzers to enhance operational visibility and minimize environmental risks. Emerging economies are witnessing significant investments in wastewater recycling infrastructure, with industrial water reuse programs increasing by nearly 51% across manufacturing sectors.

The growing emphasis on sustainable water management is further driving demand for multi-parameter analyzers capable of monitoring COD alongside pH, turbidity, TOC, and dissolved oxygen. Approximately 48% of industrial operators prefer integrated analyzer systems to reduce equipment costs and improve process efficiency. Portable analyzer adoption in environmental inspection and remote testing operations has also increased by 44%, creating additional opportunities for manufacturers developing compact and lightweight monitoring devices.

CHALLENGE

"Variability in wastewater composition and testing accuracy"

One of the major challenges in the Water COD (Chemical Oxygen Demand) Analyzer Market is maintaining testing accuracy across highly variable wastewater compositions. Industrial wastewater characteristics differ significantly depending on production processes, chemical content, and pollutant concentrations. Approximately 52% of treatment facilities report inconsistencies in COD measurements due to fluctuating organic contaminant levels. High concentrations of suspended solids and chemical interference can negatively affect analyzer performance and calibration stability.

Online analyzers operating in harsh industrial environments are particularly vulnerable to sensor fouling and contamination issues. Nearly 46% of industrial operators experience reduced analyzer efficiency caused by sludge accumulation and chemical deposition on sensors. Portable analyzers also face challenges associated with environmental temperature fluctuations and inconsistent sampling conditions during field operations.

Another critical challenge involves maintaining compliance with evolving environmental standards across multiple regions. Around 41% of manufacturers report difficulties adapting analyzer technologies to meet varying regulatory requirements for wastewater monitoring and reporting. Continuous innovation and frequent software upgrades are necessary to maintain testing precision and operational reliability, increasing technical complexity for both manufacturers and end users.

Water COD (Chemical Oxygen Demand) Analyzer Market Segmentation

The Water COD (Chemical Oxygen Demand) Analyzer Market is segmented based on type and application, with each category supporting different industrial and environmental monitoring requirements. Online COD analyzers are increasingly preferred for continuous wastewater monitoring operations, while portable analyzers are widely used for field inspections and remote testing activities. Benchtop analyzers remain important in laboratory-based water quality analysis applications. Industrial wastewater treatment facilities account for a significant portion of analyzer deployment, followed by municipal treatment plants, environmental laboratories, and research institutions. Increasing automation, smart monitoring systems, and regulatory compliance requirements continue to influence segmentation demand patterns across the global Water COD (Chemical Oxygen Demand) Analyzer Industry Analysis.

Download FREE Sample to learn more about this report.

BY TYPE

Portable COD Analyzers: Portable COD analyzers are gaining strong demand due to increasing environmental inspection activities and field-based water quality monitoring operations. Approximately 47% of environmental agencies now utilize portable analyzers for rapid contamination assessment in rivers, lakes, industrial discharge points, and remote wastewater treatment facilities. These analyzers are widely preferred because of compact size, lightweight construction, and faster testing capabilities. Around 52% of field operators report improved operational efficiency through portable systems compared to traditional laboratory testing methods. Battery-powered analyzer technologies have improved significantly, with nearly 44% of newly introduced devices offering extended operational durations and digital connectivity features. Portable analyzers are particularly popular in municipal environmental inspection programs and emergency contamination response activities. Industrial facilities conducting on-site wastewater verification have increased portable analyzer usage by approximately 39% to minimize testing delays and improve regulatory compliance. Integration of Bluetooth and cloud synchronization functions has expanded by nearly 41%, enabling real-time data transmission and centralized monitoring. These systems are also witnessing growing adoption in educational institutions and research laboratories due to ease of operation and lower maintenance requirements.

Benchtop COD Analyzers: Benchtop COD analyzers continue to maintain strong relevance in laboratory-based water analysis applications because of high analytical precision and stable testing performance. Approximately 58% of environmental laboratories globally rely on benchtop analyzers for routine COD testing and compliance verification. These systems are widely utilized in municipal laboratories, pharmaceutical manufacturing units, chemical processing plants, and academic research institutions. Around 49% of industrial operators prefer benchtop analyzers for detailed wastewater characterization and calibration verification purposes. Technological advancements have significantly improved testing efficiency, with nearly 46% of modern benchtop systems featuring automated digestion, touchscreen interfaces, and programmable testing modes. Multi-parameter functionality is also expanding rapidly, with approximately 42% of laboratory analyzers capable of simultaneously measuring COD, BOD, TOC, and pH values. Enhanced digital reporting capabilities and reduced reagent consumption are driving additional adoption among industrial laboratories. Benchtop analyzers also provide better stability under controlled laboratory conditions, supporting highly accurate organic pollutant analysis. Educational institutions account for nearly 33% of benchtop analyzer utilization because of increasing environmental science and water engineering programs focused on wastewater quality monitoring.

Online COD Analyzers: Online COD analyzers represent the fastest-growing segment within the Water COD (Chemical Oxygen Demand) Analyzer Market due to increasing demand for real-time wastewater monitoring and automated industrial process control. More than 64% of industrial wastewater treatment facilities have integrated online analyzers into centralized monitoring systems for continuous pollutant tracking. These analyzers are widely deployed across chemical manufacturing, petrochemical processing, food production, pharmaceutical manufacturing, and municipal wastewater treatment operations. Approximately 59% of treatment operators report improved process efficiency and reduced operational downtime through automated online monitoring technologies. IoT-enabled online analyzers have increased deployment by nearly 55% because industries require cloud-based monitoring and predictive maintenance capabilities. Self-cleaning systems and automated calibration functions are now integrated into approximately 51% of advanced analyzer models, reducing manual maintenance requirements. Online analyzers also help facilities maintain strict environmental compliance by enabling immediate response to contamination fluctuations. Integration with industrial automation systems has increased by nearly 48%, allowing centralized wastewater management and operational optimization. These analyzers continue to gain traction in smart city wastewater infrastructure projects and industrial sustainability programs worldwide.

BY APPLICATION

Industrial and Municipal Wastewater: Industrial and municipal wastewater applications represent the largest deployment area for Water COD (Chemical Oxygen Demand) Analyzer systems due to increasing regulatory pressure associated with wastewater discharge and environmental sustainability targets. More than 79% of industrial wastewater treatment facilities utilize COD analyzers for continuous monitoring of organic pollutants before discharge into municipal drainage systems. Municipal wastewater plants account for approximately 68% of automated COD monitoring installations because of rising urban wastewater volumes and stricter compliance standards. Online COD analyzers are heavily adopted across pharmaceutical, petrochemical, textile, food processing, and pulp & paper industries, where nearly 61% of operators rely on real-time monitoring to optimize biological treatment efficiency. Around 57% of wastewater treatment operators report improved pollutant reduction efficiency after implementing automated analyzer systems. Portable COD analyzers are increasingly used in emergency contamination inspections and field verification activities, with deployment increasing by approximately 44% in municipal inspection programs. In addition, nearly 52% of smart wastewater infrastructure projects now include cloud-integrated COD monitoring platforms to improve operational transparency and minimize environmental risks associated with untreated wastewater discharge.

Ground/Surface Water: Ground and surface water monitoring applications are becoming increasingly important within the Water COD (Chemical Oxygen Demand) Analyzer Market due to growing concerns regarding industrial runoff, agricultural contamination, and ecosystem degradation. Approximately 63% of environmental monitoring agencies now conduct regular COD testing across rivers, lakes, reservoirs, and groundwater resources to identify organic contamination levels and maintain ecological balance. Portable analyzers account for nearly 48% of field monitoring activities in surface water analysis because of their rapid testing capabilities and ease of transportation. Around 56% of environmental laboratories utilize benchtop COD analyzers for detailed analysis of surface water samples collected from industrial zones and urban drainage systems. Industrial runoff contamination monitoring activities have increased by approximately 46% due to rising concerns associated with chemical leakage and agricultural waste infiltration into natural water bodies. Government-supported water conservation initiatives have also increased deployment of automated monitoring stations equipped with online COD analyzers by nearly 41%. Integration of wireless monitoring networks and cloud-based reporting systems has expanded significantly, enabling centralized supervision of large-scale environmental monitoring operations and improving pollution response efficiency across water management authorities.

Drinking Water: Drinking water applications are witnessing growing demand for Water COD (Chemical Oxygen Demand) Analyzer technologies as governments and utilities strengthen drinking water quality standards and public health monitoring initiatives. Approximately 58% of drinking water treatment facilities conduct regular COD analysis to ensure low organic contamination levels and maintain safe potable water distribution systems. Benchtop analyzers are widely used in centralized laboratories responsible for drinking water quality verification, accounting for nearly 54% of testing operations in municipal utilities. Portable analyzers have experienced a 39% increase in deployment for rapid inspection activities during emergency contamination events and infrastructure maintenance programs. Around 47% of smart water distribution projects now integrate automated water quality monitoring systems equipped with COD analyzers to enhance operational visibility and contamination detection. Increasing investments in advanced filtration and water purification technologies have further accelerated analyzer adoption across drinking water facilities. Nearly 44% of utilities are implementing digital monitoring platforms capable of integrating COD analysis with turbidity, chlorine, and pH monitoring for comprehensive water quality management. These technologies support faster contamination detection and improved operational reliability across urban and rural drinking water networks.

Seawater: Seawater monitoring applications are gaining importance in the Water COD (Chemical Oxygen Demand) Analyzer Market because of increasing marine pollution concerns, offshore industrial operations, and desalination plant expansion. Approximately 49% of coastal environmental monitoring programs now include routine COD testing to evaluate organic contamination levels in marine ecosystems. Offshore oil and gas facilities account for nearly 36% of seawater analyzer deployment due to wastewater discharge compliance requirements and environmental protection mandates. Around 42% of desalination plants conduct continuous COD analysis to monitor feed water quality and optimize membrane filtration efficiency. Portable analyzers are widely used in coastal inspection operations, representing approximately 38% of marine water quality testing activities. Industrial shipping ports and marine logistics hubs have increased investment in automated seawater monitoring infrastructure by nearly 34% due to rising environmental sustainability regulations. Online analyzer systems integrated with remote monitoring software are increasingly preferred for offshore monitoring operations because they reduce manual sampling requirements and improve real-time contamination tracking capabilities. In addition, approximately 31% of marine research institutions utilize advanced benchtop analyzers for detailed seawater quality studies and environmental impact assessments.

Others: Other applications within the Water COD (Chemical Oxygen Demand) Analyzer Market include aquaculture, academic research, food production quality control, mining operations, and environmental testing laboratories. Approximately 46% of aquaculture facilities conduct regular COD analysis to maintain optimal water conditions and reduce biological contamination risks affecting aquatic species. Mining operations have increased analyzer deployment by nearly 37% due to stricter wastewater discharge monitoring regulations associated with heavy metal and chemical contamination. Educational and research institutions account for approximately 33% of benchtop analyzer utilization because of growing environmental science and water engineering programs focused on pollution monitoring technologies. Food processing plants also rely heavily on COD analyzers, with nearly 41% implementing routine wastewater testing to ensure regulatory compliance and improve treatment efficiency. Portable analyzers are increasingly utilized in temporary field research stations and environmental impact assessment projects due to mobility and rapid testing capabilities. Around 35% of specialized environmental consulting firms now integrate digital COD analysis systems with multi-parameter monitoring technologies for broader water quality assessment services across industrial and ecological monitoring applications.

Water COD (Chemical Oxygen Demand) Analyzer Market Regional Outlook

Download FREE Sample to learn more about this report.

North America

North America remains one of the leading regions in the Water COD (Chemical Oxygen Demand) Analyzer Market due to advanced wastewater treatment infrastructure and strong environmental compliance standards. Approximately 81% of industrial wastewater treatment facilities across the region utilize automated COD monitoring systems for continuous discharge management. Municipal treatment plants account for nearly 69% of analyzer installations because of strict pollution control regulations and increasing urban wastewater volumes. Around 62% of pharmaceutical and chemical manufacturing facilities have adopted online COD analyzers integrated with cloud-based monitoring systems to improve operational efficiency and regulatory reporting. Portable analyzer usage has increased by approximately 43% among environmental inspection agencies conducting field-based contamination assessments. Smart water management programs continue to drive technology upgrades, with nearly 54% of newly modernized treatment facilities deploying digital analyzer technologies featuring AI-assisted monitoring functions. In addition, research laboratories and educational institutions contribute significantly to benchtop analyzer demand, accounting for approximately 38% of laboratory-based water quality testing activities throughout the region.

Europe

Europe demonstrates substantial demand for Water COD (Chemical Oxygen Demand) Analyzer systems due to increasing sustainability initiatives, industrial wastewater treatment modernization, and strict environmental directives. Approximately 76% of municipal wastewater treatment facilities across Europe now rely on automated COD analysis technologies for pollutant control and treatment optimization. Around 58% of industrial operators have upgraded from manual testing procedures to online analyzer systems equipped with automated calibration and remote monitoring functions. Environmental monitoring programs associated with river conservation and groundwater quality management have increased portable analyzer adoption by nearly 45% across the region. Smart wastewater recycling initiatives are also driving analyzer demand, with approximately 49% of industrial water reuse projects incorporating continuous COD monitoring technologies. Benchtop analyzers remain highly utilized in laboratory operations, representing nearly 42% of testing activities in environmental research institutions and municipal laboratories. Integration of multi-parameter analysis capabilities has expanded significantly, enabling simultaneous monitoring of COD, TOC, pH, and turbidity within centralized wastewater management systems.

Asia-Pacific

Asia-Pacific represents the fastest expanding regional market for Water COD (Chemical Oxygen Demand) Analyzer technologies due to rapid industrialization, urban wastewater growth, and increasing environmental monitoring investments. Approximately 43% of global industrial wastewater monitoring installations are concentrated within the Asia-Pacific region because of expanding manufacturing activities and rising pollution control initiatives. Municipal wastewater treatment infrastructure projects have increased by nearly 61%, accelerating deployment of online analyzer systems for real-time pollutant monitoring. Industrial sectors including textiles, chemicals, food processing, electronics, and pharmaceuticals contribute significantly to regional analyzer demand. Around 57% of newly established wastewater treatment facilities in the region now utilize digital COD monitoring technologies integrated with smart automation systems. Portable analyzer deployment has increased by approximately 48% due to rising environmental inspection and groundwater quality assessment activities. Governments are also investing heavily in smart city water management projects, with nearly 46% of urban wastewater modernization programs implementing cloud-connected monitoring platforms. Benchtop analyzers continue to experience strong demand from academic laboratories and industrial quality control facilities throughout the region.

Middle East & Africa

The Middle East & Africa region is witnessing gradual growth in the Water COD (Chemical Oxygen Demand) Analyzer Market due to increasing investments in desalination, industrial wastewater treatment, and water reuse infrastructure. Approximately 51% of desalination facilities in the region conduct routine COD monitoring to optimize feed water quality and maintain filtration system performance. Industrial wastewater monitoring demand has increased by nearly 44% across petrochemical, mining, and oil & gas operations due to stricter environmental discharge standards. Around 39% of municipal wastewater modernization projects now include online analyzer technologies for continuous contamination monitoring and operational efficiency improvement. Portable analyzers are increasingly used in remote environmental inspection programs and groundwater quality assessments, accounting for approximately 36% of field-based monitoring activities. Government-supported water conservation initiatives are driving adoption of smart water management systems integrated with digital COD analyzers. Research institutions and environmental laboratories are also expanding benchtop analyzer usage to support regional water sustainability studies and industrial pollution management programs. Increasing urbanization and industrial diversification continue to support regional market development.

List of Key Water COD (Chemical Oxygen Demand) Analyzer Market Companies

• Hach (Danaher)
• Endress+Hauser
• Thermo Fisher Scientific
• Xylem
• Shimadzu
• Lovibond (Tintometer)
• Horiba
• LAR Process Analysers
• Mantech
• DKK-TOA
• KIMOTO ELECTRIC
• LaMotte
• Hanna Instruments
• KORBI
• Uniphos Envirotronic
• SailHero
• Focused

  Water COD (Chemical Oxygen Demand) Analyzer Market Report Coverage

  REPORT COVERAGE	DETAILS
  Market Size Value In	USD 365.03 Million in 2026
  Market Size Value By	USD 695.59 Million by 2035
  Growth Rate	CAGR of 7.43% from 2026 - 2035
  Forecast Period	2026 - 2035
  Base Year	2025
  Historical Data Available	Yes
  Regional Scope	Global
  Segments Covered
  	By Type Portable COD Analyzers Benchtop COD Analyzers Online COD Analyzers
  	By Application Industrial and Municipal Wastewater Ground/Surface Water Drinking Water Seawater Others