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Must Require Water Standards:

1. pH level – between 7.2 and 8 (if higher than 8, swimmers will get skin rashes, if lower than 7, it can sting the eyes)
2. Calcium hardness – 200- 250 ppm for concrete pools and 175-225 ppm for vinyl pools
3. Alkalinity – 120 – 150ppm
4. Water clarity – a 4-inch b&w object in the deepest end should be visible from the deck
5. Total coliforms – less than 10 in 100 millilitres
6. Fecal coliform – 0