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Eheim pressure problem

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Hi all I've got a eheim classic 350 and the last couple days I've noticed it's only pumping about a third of the pressure it was its only about 2-3 months old checked hoses no blockages filter not clogged pulled out impella does anyone else have any ideas what it could be thanks

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The slime coating inside the hoses slows mine down sometimes. I have a Eheim hose cleaning kit with small bristle bushes that you drag through hoses and increases the flow quite a bit. Even though they look clean to begin with it definitely helps also the magnets on the impellor can come loose so a clean up and silicon them back on again can pick up the flow rate. I read a lot of people replace their impellors but i found that's all it takes.

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