I recently needed a new filter, so decided to go "big" as I have a lot of trees and gunk that falls in the pool throughout the year. I got the Pentair 100 sq ft quad DE filter. I was cleaning up a green pool when I first got it, so I couldn't really see anything coming back out of the ports in the pool. I used about 14 scoops of DE with the blue scoop from Leslie. They advertise as 1lb, but I've found it closer to .75. I went through the SLAM process as I was cleaning up a green pool and the pool cleaned up nicely. I backwashed the filter and recharged with about 80% of suggested DE.
Since I installed the new filter, I've been having some issues with my pressure side Polaris. The filter screen at the port has been getting clogged with what appears to be DE and small red bits that fall from the trees here. Being that the polaris pump is pulling from the exit of the Pentair filter, it's pretty easy to see that some stuff is getting past the filter.
I just broke down the filter to make sure that everything was seated properly and everything looked good. I sprayed down the cartridges and cleaned everything from top to bottom. I reloaded with DE and I can see some of it coming back in to the pool.
As the cartridges look good and the filter body/assembly looks good, I'm a little confused as to what's happening.