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    New CPO in over my head with low chlorine levels

    I manage a 99,000 gallon plaster in-ground pool with sand filters and I can't recall the flow rate or pump size... both of which have been used on this pool for years. The most recent levels are Cl: 1.0. Ph: 7.6. CYA: 0. TA: 90. Clarity is very clear. Temp is around 83 depending on the time of...