I have ran SWG this for about 2.5 years at 20% and produced great results. I have been testing the water a lot lately and did a super Chlorinate -100% early last week as I though I had alge. did not have it- stick reading purple with high chlorine after 24 hours of running and got tested. I added some water to take it down a notch and moved to 40% recently. It' not making the stick purple at all and I am taking a sample in today. I even moved to 60% yesterday for 8 hours and got the same results this am. Salt levels were verified at 3200 and SWG bubbling as usual when I observe. I think its it's dying but not sure how to verify. The water is cystal clear and chlorine I would say is 1 or less - white stick reading with no purple. 21k fiber 16x36 Any ideas