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    Mottling on the pool floor

    March 28, 2024 Good Afternoon, I have a 5 year old gunite pool. I am a new pool owner, so I trust there is a lot to learn. I perform water tests every third day. (PH, chlorine, alkalinity, hardness, CYA, etc. And then take the appropriate action. I keep the PH between 7.2 and 7.4. The...