pH indicator liquid 30 ppm

Our pH indicator liquid is ready-to-use and can be used without mixing with aquarium water or other liquids. It is calibrated to appear green at approximately 30 ppm CO2 when used in a drop checker.

Add 2–3 ml of indicator liquid to your CO2 drop checker, then place it in an area of the aquarium with good water flow.

After a few hours the colour in the drop checker will change:

• Blue suggests too little CO2.
• Green indicates the intended CO2 range.
• Yellow suggests too much CO2, which can harm fish.

Change the pH indicator fluid once a month to continue measuring accurately.