Brand New to this site, so I apologize if I'm asking questions about something that has already been discussed. Unfortunately, I can't find a way to search this board for a particular topic.
Anyway, I have been using Cellulose Fiber in my DE filter grids this summer. The Fiber works great but my issue is with back-washing. When I backwash with DE and even the first few times with Cellulose Fiber I could see the material back-washing through the glass viewer on the system. For some reason I don't see anything being discharged now and actually had to completely take the filter apart and spray the filter grids (I do this twice a year regardless of issues), and have continued to have to do so each time it needs back-washing. The Cellulose Fiber was caked on thick (looked like wet cardboard) and fell off in chunks. Trying to figure out if my system is not back-washing properly (water is flowing out as normal when back-washing), or if the shock I use is causing some kind of reaction that makes the Cellulose Fiber stick to hard to the grid. I use a common vinyl liner safe shock that I buy at a reputable pool store and I have been using the correct conversion of Cellulose Fiber from DE. I have a 20' x 40' in-ground 35,000 gallon pool.