I have a customer with an indoor 10,000 gallon heated pool with a cartridge filter that's about 7 years old. They installed a salt system about 2 years ago and have always kept the pool chemistry inline themselves. This is an elderly couple and they use the pool for physical therapy. Within the past month the plaster on the pool has become extremely rough. Think 60 grit sandpaper or worse. The problem is over the entire pool and not alocated to one area. the pH hasn't been below 7.2 and the calcium level is at 400ppm. The heater shows no signs of high acid content and there is no plaster decomposition at the bottom of the pool. Any ideas?
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