I've read the sticky on this subject and I am still confused.
We have a 60 sq. ft. Pentair FNS DE Filter. How much DE do I use after backwashing?
As per the sticky I calculated the square footage of my filter and divided it by 8 which is 7.5. On my pool equipment it says one, one pound coffee can equals 7lbs of DE. So I would add just a little more than one coffee can of DE? That didn't sound correct so I called to pool supply store. She said I needed to add 12 coffee cans of DE, that REALLY doesn't sound correct.
When I used to do this myself, prior to gettting rid of the pool service, I thought I put it 4 coffee cans, as per the Pool Builder, but I can't really remember for sure. That has been several years ago.