I know this has been covered a few times, but mine is actually a more severe case than I've been reading.
my filter doesn't filter AT ALL. I have been running the pump almost non-stop for a full week and it hasn't cleared at all, I still can't really see the second step.
I have taken the filter completely apart and checked each and every grid very thoroughly, no torn fabric at all. replaced the top manifold about 12 months ago with a "new" model that has a breather valve on the top (man I hate this thing) so I bought a new breather valve to the tune of $25. put filter all back together and attack the multiport as I had water going through waste when on filter. took the multiport in and had them put on a new spring and washer (on top) and installed a new gasket. put everything back together and put it on "Rinse" to charge the filter (was told rinse to charge, then to filter after charged), and there is no DE running through the sight glass when on rinse. switch it to filter and clear water shooting back into the pool, thought all was fixed.
go out 30 minutes later because my pool cleaner guy isn't doing his job, he's taking a nap in the deep. I pull his connection from the wall (after turning off the secondary pump) and his wall connector filter, for lack of a better word, is clogged with debris and some DE. clean it out and put him back on and again 30 minutes later same thing.
the up pipe in the filter had lots of wobble to it, but it has always been like that since I owned the pool. the gasket at the top isn't "tight" and theres black marks all over the top of the up pipe, but they don't go past where the manifold sits so that is nice and tight. what could be the problem?
btw, chlorine levels were raised to 15ppm (added 7 gallons 6% bleach) last saturday when I started running the pump non-stop. added 5 gallons of bleach after 12 hours, then 24 hours, and pool is a blue grey (very little green), but if its not filtering it, I'm just wasting my time.