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The pH scale is 0-14 and is a measure of whether the water is acidic or alkaline. Water with a pH of 7 is neutral, water with a pH below 7 is acidic and water with a pH over 7 is alkaline.
The ideal pH level is between 7.2-7.6, promoting bather comfort, optimum chemical efficiency and protection of pool equipment.
For low pH readings below 7.2 use pH plus, if the level is over 7.6 use pH minus to reduce
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