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Yes. A pool pH too high may result in a rash, red, or stinging eyes for swimmers. It means chlorine isn't as abundant as it needs to be to neutralize germs. A pH that is too low means the water is too acidic, which can cause similar bodily irritation and damage to your pool's lining and the surrounding plaster, stone, or tile.

An easy way to know whether your sand filter has enough sand is to check how full the filter is and what the sand looks and feels like. The filter container should be two-thirds to three-quarters full of sand. Look for interior marks indicating the ideal sand level. If you put your hand into the sand, it should flow through your fingers without clumping. The filter pressure gauge is also an easy indicator—the right amount of sand leads to normal pressure, while too much or too little sand can cause high or low pressure.

If your pool’s pH level is too high, chlorine won’t be as effective. Since chlorine is responsible for sanitation and keeping bacteria out of your pool, a high pH level could create a higher risk for bacterial diseases. It can also make you more susceptible to rashes and infections (like swimmer’s ear). Need to lower your pool’s pH? You can do it yourself for between $5 and $40.

A good rule of thumb is to add one or two 40-pound bags of salt for every inch of rain, but you’ll want to test your salt levels first to ensure you’re adding the right amount. Rainwater can dilute the salt levels in your pool, so after significant rainfall, test the levels and add the appropriate amount of salt to bring it back to the ideal level.