I have a T-15-Cell currently at 24.2V and 6.4A. Salt is 3500 and 72 degrees.
Like mas985, I'd like to know what cell you're using.
I've used phosphate lowering stuff twice over the last 8 years when phosphates got to 3500+. Basically had an algae bloom with the only evidence being no chlorine residual and that condition kept coming back over a month even though I had shocked repeatedly.
I didn't have time to keep shocking so it worked for me but that's a rare condition. I'll almost bet if you shocked your pool HARD you'll be back in business.
Hope this helps, Tony
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