Hi , thanks for having me , I have a 27' round above ground pool , just installed a Hayward cl-220 , I have a sand filter on this pool. The first 2 years was fine then all the sudden this year it eats chlorine like its the things job and for some reason it just doesn't keep the algae away . I got a to-100 in the mail today that I ordered so I was hoping someone can tell me what's need to do , thanks in advance . Ph- 8.2
Fc - 2.0
Cc - 1
Tc - 3.0
Ta - 240
CYA - filled to the top of the black dot tube and can still barely see the dot . So maybe 10 for cya ?