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...