I am sure this has been discussed already, but my search terms (DE, sand, area) seem too generic to find the answer in the archives.
I am looking into adding DE to my sand filter (Sta-Rite System 3, S8S70), and I have read that the small bags are better than the large ones (less mess).
However I can't gauge the amount needed. My filter is 3.4 sqft, and the bags (EZ-DE Swimming Pool Diatomaceous Earth Filter Media) are sold for 36, 48, or 60 sqft DE filters.
What is an optimal amount to use 2-3 times DE after backwash with my sand filter?