evilknieval69 Posted January 29, 2007 Report Share Posted January 29, 2007 There was a bit of talk a week or two back about canister filters and if they can be used at any position around the aquarium, be it above, below or equal too. Just reading through a post on aquatic plant central i found this The flow going into a pump is exactly equal to the flow coming out of a pump (conservation of mass). So what, exactly, does the pump do? It raises the pressure of water in the output line. The pumps that we use are really horrible at developing suction on the intake line. They require a constant supply of fluid, and if it comes in already under a bit of pressure, so much the better. This is why Eheim recommends that their filters be located below the tank. The water column in the intake line acts to "preload" the pump. If you place the filter above or level with the tank, the pressure inside the canister is negative. This will lead to impeller cavitation (noisy and shortens impeller life), and gasses will come out of solution (we'd like the O2 and CO2 to remain dissolved). Here is the thread here, but you may need to register to read it Quote Link to comment Share on other sites More sharing options...
Luke* Posted January 29, 2007 Report Share Posted January 29, 2007 Interesting. Cheers Quote Link to comment Share on other sites More sharing options...
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