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Our plaster is about 4 years old. Recently we noticed that it is discolored in a number of places (only on the bottom, not on the sides or in the spa). The discoloration is dark and a The person that did the replastering claims it is because our CYA levels were too high. Does that make any...

My heater was installed in May 2020 and it has worked in the past. There are no lights on my heater control panel and it is not working. I check the power and I have 240 coming in. The fireman switch fuse appears to be good and I have power into the board (tested with a voltage tester--three...