Well Water: How to Balance pH and Remove Impurities in Your Aquarium
Veterinary & Aquatic Services Department, Drs. Foster & Smith

Q. We use well water for our freshwater aquarium and we are having a difficult time lowering the pH. We tried using pH conditioners and the pH level will go down for a few days, but then it starts climbing again. What's going on and what can we do?
A. In some areas, especially in regions that have limestone deposits, well water will contain high levels of minerals, making the water "hard." Water hardness is closely associated with pH and influences the ease at which pH can be altered. The high mineral content functions as a buffer and counteracts the effects of pH conditioners.

In order for pH conditioners to work properly, the minerals must first be removed from the source water. The most effective way to do this is through the use of a reverse osmosis (RO) unit. It can remove up to 99% of the minerals and other impurities in your water.

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