I spoke to a Pentair technical representative concerning my IC40 and he thinks high phosphate levels could be causing the problem. I see nowhere on my K-2006 how to test for phosphates. My current levels are: PH 7.3, CA 50, TA 100, Salt 3400. When not adding bleach, my FC is struggling to maintain 1.5. I've increased my run time to 16 hours & my SWG output levels to 100%.

Can someone tell me how to test for phosphates? Thx