3 hp on your size pool is like having a V-8 on a lawnmower! I personally will bet it's torn up your cartridge from being too big. Even if it's up-rated it's at least 2-2.5 hp and that is STILL far too big. Besides destroying your filter, it wastes electricity. I cannot imagine that that pump is matched to that filter.
I'd have them swap it for something smaller--a full-rated 3/4 or uprated 1 is PLENTY for your pool. In fact, I would think a full rated 1/2 horse would be the appropriate size for a 10,000 gallon pool, which I'm guessing yours is. Another good choice would be a 3/4 two speed pump. Both will save you a fortune on wasted electricity. Plus they'll run quieter.
Even the cruddy cartridge filter that my old 15'x3' EasySet donut used (with a 1/6hp pump) did far, FAR better than you are describing. Carts should filter better than sand, nearly as well as DE filters. Something is very, VERY wrong.
Go to Ben's PoolSolution.com and read the "bigger pump scam" article.
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