I'm having problems this season with the system being able to keep chlorine in range. System is about 3 years old. First year worked great consistently had 2-3ppm all summer with IC40 set at 25%. Second year started out ok but then I had to increase output to 50% to keep chlorine in range then started getting lot of white scale collecting below the returns so I acid cleaned the cell and after cleaning it was good at 25% again. So I clean the cell now when I start to see low chlorine which was couple more times in past year, but now this is not helping. I cleaned the cell few weeks ago and keep increasing the output but I can't get chlorine level up. I know it's making sanitizer because if I do a 24 hr super chlorinate cycle I will detect chlorine but barely 1ppm. Had the water tested at local pool store to confirm my numbers. PH, CYA, are good. I was told I have nitrates at 30ppm and will need to drain my pool and refill. Does this sound right are the nitrates consuming all the sanitizer, or could the IC40 be failing?
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