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You need to dilute or change the water only when one or both of those levels exceed desired levels. There is no regular schedule for this, as the levels and their increase rate will vary from pool to pool. Get reliable test equipment and test the water yourself periodically, or take a fresh sample of water in to your local pool store to have the levels checked.

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Q: When do you need to drain residential pool and replace water due to CYA and TDS?
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