How to use:
Determine the pH of aquarium water with an API pH Test Kit. To lower pH, add 1 ml of 38 litres of aquarium water. Take another pH reading before adding another dose of pH down solution. Use when setting up a new aquarium, adjusting pH, or changing water. pH in an aquarium can fluctuate due to fish waste, uneaten food and addition of tap water, it is recommended to test water for pH weekly.
