I am confused about how best to use the DE for my sand filter. I am currently SLAMing the pool since Wednesday. It is not totally clear yet but I have not needed to add any chlorine today because added fill water to pool which brought the CYA back down to around 32. FC was at 14.0 most recently and 22.0 FC this am.
Have added 1 cup of DE for past 2 days after every backwash of the filter to raise the pressure 1% (about 3-4 times a day). Backwashed when pressure gage had gone up 25% as recommended here (to 14-15% from 10%).
Side of DE box says to add 1 lb. (or 6 cups) of DE to filter or when gage rises 1% and let the filter run for 24 hours before backwashing. My pressure would go way up I think with 6 cups of DE at one time. And am I wasting what I am putting in if I don't let it work 24 hours before backwashing?
What is the most effective use of the DE?