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So I have had this problem with all 3 of my HOB filters (Two Top Fin Silentstreams, One Penn-Plax Cascade 80), the flow on them is great for one or two weeks, but then just slows down to the point of a drizzle. I've tried taking the impeller out and putting it back in, but nothing happens. This is getting to the point of insanity and I can't sleep as soundly anymore, please help, what is wrong?
