thank you for your patience. yes this has been very frustrating. the SAC is 5 ppm. the ph is 7.2 , the PA is 110, SH is 180, the CYA is 40 . The chemicals I have used recently is liquid bleach and hydrofloc. Yes I did the DE to my sand filter with very very slight results in terms of water clarity. My Calcium hardness is 180 which is low. It should be anywhere from 200-400 from what I understand. I have backwashed it 3 times in the past 5 days. I have not added Baquacil, Soft Swim, Pristine Blue, or other PHMB chemicals to the pool.