Depending upon aquatic plants and their growth conditions, the amount of CO2 required changes dramatically.

This Drop Checker is an original glassware unit, designed to indicate the CO2 amount diluted within the water with colour change of the pH reagent inside. In order to understand the proper amount of CO2 supply a colour change occurs within the drop checker reflecting your C02 levels. Drop checker comes complete with:

- pH reagent bottle and clear suction cup

Directions

1) Turn drop checker upside down and place 3 drops of reagent inside the checker.

2) With a pipette (not included) add tank water to drop checker so that it's half full of water.

3) Turn drop checker over carefully (without spilling contents) and place inside aquarium so that it is visible.

4) Within 1 hour drop checker will display a reading according to your C02 levels. Green is the ideal colour, yellow is too much C02 and blue is too little (adjust C02 output accordingly).

5) After each water change, renew reagent in drop checker by following directions above.