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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.

Most of the time, though there may be some code variations on the local level, a water source like a pool requires a GFCI breaker. These breakers detect electrical leaks of 5 mA or more and trip the breaker. However, the size of the pool and motor type determine the exact GFCI needs. A GFCI outlet with a reset button may be enough for an aboveground pool with a small motor or pump. Consult a pool electrician to determine the appropriate installation and protection measures needed for your pool.

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.

A black tarp will indeed heat your pool. Black absorbs more heat than other colors. This heat will transfer down to the water in your pool and help increase the temperature. It will not be extremely effective at raising the overall temperature, but it can help maintain the current temperature.