Seachem Co2 Indicator Solution - 50ml Seachem Co2 Indicator Solution - 50ml is a replacement colour-changing indicator solution for Seachem Glass pH Checker units, used to visually monitor CO2-related pH changes in planted aquariums. Seachem CO2 Indicator Solution for Glass pH Checker This replacement solution is used inside Seachem Glass pH Checker glassware. The solution changes colour as pH changes in response to dissolved CO2, giving planted aquarium keepers a simple visual reference for CO2 system adjustment. CO2 Indicator Solution Benefits Replacement indicator solution for Seachem Glass pH Checker. Changes colour according to pH changes caused by CO2 levels. Recommended for planted aquariums with CO2 injection systems. Helps make CO2 monitoring easier with a quick visual reference. Useful for routine replacement when the original indicator solution is depleted or needs refreshing. 50 ml bottle supports repeated refills. Seachem CO2 Indicator Solution Details Product type: Replacement CO2 indicator solution Primary use: Visual CO2 and pH monitoring with Seachem Glass pH Checker Suitable systems: Freshwater planted aquariums with CO2 injection Colour reference: Yellow to green to blue depending on CO2-related pH level Compatible accessory: Seachem Glass pH Checker Bottle size: 50 ml Directions for Seachem CO2 Indicator Solution Use with Seachem Glass pH Checker. Hold the funnel side of the checker upward and fill the small bulb with indicator solution. Slowly turn the funnel side down to avoid spilling the solution, then place the checker in the aquarium with the funnel side down so air remains trapped in the funnel. Position it away from the CO2 diffuser for more useful monitoring. Refresh the solution as needed for clear colour reading. What's Included 1 x Seachem Co2 Indicator Solution - 50ml