Pond pH is one of the most important parmaeter to consider when testing a pond. Some tap water systems suffer a low pH (below 7.0). Pond pH may also degrade over time, becoming more and more acid. If pond pH is too low, fish and plants will suffer. Plants may die in water that fish contnue to live in due to low pH.
Safely raises pH of tap or pond water
Increase alkalinity deteriorated by organic acids in older ponds