What is your filter material made of?

I pre-filter with the screen door stuff.

Then it goes to open cell foam, that is only cleaned once/year.

Ours is some very expensive thick
white material we bought at a LFS that caters to the pond crowd. He only
carries the best products. It's like white brillo but tougher and less
dense. It's about 2 1/2" thick and seems to be made of some kind of
extremely tough plastic.

Sounds like Matala, I think it is called. Can you find a picture on the
web?

Maybe your filter isn't big enough? ~ jan

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Tri-Cities WA Zone 7a
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