Water/Gravity - Filter elevation Questions - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 03-04-2012, 03:17 PM Thread Starter
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Water/Gravity - Filter elevation Questions

Will elevating my external filter increase the flow?

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post #2 of 6 (permalink) Old 03-04-2012, 03:34 PM
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Its debatable. There is is much water pressure pushing down in the inlet side, as there is pushing against the pump on the outlet side. So theoretically there wouldn't be much difference. However you also have to consider friction, so with the shorter hoses, there would be less friction. Overall I would say that there would be a small amount of increase, but whether or not you could really tell, I don't know.

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post #3 of 6 (permalink) Old 03-04-2012, 04:17 PM
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Filters act as a siphon to suck the water into them, the lower of the filter the greater the siphoning action. The propeller merely pushes it back up. When I lowered my filter from a higher position, I noticed a pretty significant increase in flow. My Eheim (2236) calls for a minimum of 40 cm and a maximum of 150 cm from the top of the intake tube. Check your manufacturers specs and make sure you fall between them.
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post #4 of 6 (permalink) Old 03-04-2012, 04:24 PM
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this is a plumbing principle basically if the intake is 1 metre above the outlet them this is considered 1 metre of head. 1 metre of head = 0.1 bar of pressure so if you were to lower the filter or raise the intake this would increase the head thus raising the pressure hope this helps

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post #5 of 6 (permalink) Old 03-04-2012, 04:50 PM Thread Starter
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thank you all! Not worth to effort to raise it, raised it temporarily without doing anything to the hoses, no detectable increase or decrease in flow at outlet, maybe I should stop being lazy and clean the damn thing, its been 6+ months


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post #6 of 6 (permalink) Old 03-04-2012, 09:55 PM
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The lower the canister, the higher the static pressure in the filter, so the less likely cavitation will occur. Other than that, there should be no difference beyond hose lengths.

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