Maintaining a balanced, stable pH is vital to the health of aquarium livestock and efficiency of the bio-filter. The pH of an aquarium can fluctuate due to biological and/or chemical activity within the aquarium. Often, the pH of a new system tends to measure at a higher pH value and subsequently drops as the system ages. Fritz pH Neutralizer adjusts high and low pH values to 7.0, a level at which most freshwater community fish and plants thrive and reproduce. Fritz pH Neutralizer also removes chlorine, chloramine and ammonia. Use when setting up new aquariums, adding water or when making pH adjustments to existing aquariums.