Plaster in-ground pools have very strict requirements to stay open. The water must be clear, the bottom drains must be visible
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When my kids were young, I had a large above ground pool. I filled it with city water from a garden hose. Very expensive and long process. Within 48 hours after filling, the water turned black as coal.
I knew the kids couldn’t possibly track that much mud into it in such a short time, the pool was surrounded by grass.
I went to the city water company to seer if I could get any info from them. When the lady saw my address, she had an explanation for me. My section of town was on a new well and the water had ca lot of magnesium in it and after it sits for a while it turns black. She assured me that it was harmless to drink.
People have died in murky hotel pools, with their bodies undetected for a few days.
I’m a fanatic about any pool in any of my communities being 100% compliant.
I would like to give that joker a “behind the woodshed” treatment. He not only cost these people money, he endangered lives.