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Pool chemical levels should include a pH between 7.4 and 7.6, alkalinity between 80 to 120 ppm, and chlorine from 1 to 3 ppm. The size and type of your pool determine additional chemical levels, such as stabilizers and pool shock, but you can get to know these numbers using our pool maintenance 101 guide.

How long a pool liner lasts depends on the type of pool. Most in-ground pool liners last between six and 12 years, while aboveground pool liners last anywhere from six to 10 years. You can extend the life of your pool liner by maintaining proper pool chemistry, adding chemicals individually to avoid staining the liner, using a pool cover to protect it from the sun, and keeping sharp objects away from it.

The lifespan of a semi-aboveground pool depends on the lining, but they last between seven and 15 years on average. This is right in line with what you can expect from a standard aboveground pool. In comparison, an in-ground pool can last up to 75 years with a well-maintained concrete liner.

The best way to kill off an algae bloom in an aboveground pool is to shock it with a large dose of chlorine. Shock typically kills off algae in about one to three days, although it can take longer if the pool water is in poor condition. After the shock treatment, add algaecide to prevent algae from growing back, and test the water every few days with test strips to ensure the pool’s pH doesn’t get out of whack.