I never had any problems in the 7-years of moving into this home with this pool. Last spring we had it re-plastered and through the winter I had a bigger problem with hi pH that ever. After taking the cover off I saw this when adding chems but just thought is was a dirt like powder that I have seen before but trying to clean it and its hard. Just looks and feels like hard sand. It's on shallow water mostly like the steps and seats
I would like to get some feedback before I start my own course of treatment but thinking a no drain acid wash maybe, maybe some ScaleTec too. Any thought of just going low on pH for a couple of weeks?