If the DE doesn't work, try adding a little bit of polyquat algaecide. Not only is it an algaecide, but it also acts like a clarifier, clumping smaller particles together, which are more likely to get stuck in your filter. You don't have to use much, I bought a bottle recommended on the Pool Solutions site 2 years ago, and I have used it twice, only putting in 5 ounces each time, and it cleared my pool overnight, and within a week crystal clear. It will drop the FC levels so you have to plan on that.
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