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Heavy rains this week lowered hardness from 300 to 150. I have heard low calcium causes etching. Calcium is sold out due to high demand from all the rain in this area. How long do I have before etching can start? FCA - 8.68 TCA - 8.68 pH - 7.9 TA - 95 Calcium - 152 CYA - 85 Phos - 16

The biggest problem is very low soft water. In many areas the tap water has 0 CH so people constantly need to add CH. Adding 8-15 lbs a day of CH per day gets expensive but I can understand why she was doing it with the readings below as she was trying to get her CYA down and stopped using...

It appears the only solution to high CYA is to drain a pool. Yet, draining a pool even a few inches is extremely expensive. Besides high replacement water costs (at least $2000 for my 40k gallon pool), now you need a whole new set of chemicals to rebalance (calcium hardness, chlorine, acid...