I never ran an ato either. The height of your drain comparment staying the same is more critical then return. Unless the pump begins to suck air. The weight of 4-6 inches of water varying in your return compartment is minimal @ 0.433lbs/ft but anything is possible. One more thing. Installing a valve on the outlet of your pump and throttling slightly will give a more constant flow rate too. If the pump is being held back by a valve the level fluctuation will cause less of a change in the flow rate of the pump. That is if you have a return pump with enough extra flow to throttle it.
Last edited by Skimmin; 10-01-2014 at 06:44 PM.
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10-01-2014, 06:40 PM
Hybrid Mode
