|API pH Down adjuster lowers pH to make freshwater aquariums more acidic for fish & plants when levels rise too high. pH is the measure of acidic or alkaline conditions in water, where a value of 7.0 corresponds to a neutral pH, pH values about 7.0 are considered alkaline, and pH values below 7.0 are considered acidic.|
Determine the pH of aquarium water with an API pH TEST KIT. To lower pH, add 1 ml. for each 10 gallons of aquarium water. Take another pH reading before adding another dose of pH DOWN pH adjuster.