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Testing the pool water is the most important regular care task, for the health and enjoyment of your swimmers and the longevity of your pool.
Frequency
Ideal Range (ppm)
Total alkalinity, plastered pools
Every month
80 - 120 ppm
Total alkalinity, vinyl, painted or fiberglass pools
Every month
125 - 150 ppm
pH level of water
Every other day
7.2 - 7.6
Free chlorine
Every other day
1 - 3 ppm
Stabilizer-conditioner (cyanuric acid)
Start and middle of season
Minimum 30 ppm with tabs; minimum 75 ppm with liquid
Shock treatment
Every 7 to 10 days
5 - 10 ppm
Water hardness
Seasonally
100 - 500 ppm
Drain and refill pool
5-7 years
Always follow instructions for each test
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