You might try the DE trick that the other mods use on their sand filters--use just enough DE to make your pressure rise by 1 psi (that rise is slow, so start with a handful and give it 30 minutes or so before adding more). That will help filter out some of the smaller stuff, if the problem is that it's going through your filter. You might also try looking at the returns after you add the DE to see if you see it coming back into the pool. If so, then you have an issue with your filter that needs to be addressed.

Janet