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    My (GREEN) cement pond

    I'm relatively new here, and I've learned so much from this site! I have an unintentionally green cement pond that I'd like to reclaim as a swimming pool. It was built in 2000 and has never been drained, so it has some wise old hardened water in it: July 13, 8:15 pm FC: 0 CC: 0 TA: 140 pH: 8.0...