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I run two returns pumps but no check valves. Since they require additional maintenance and can fail my sump is large enough that when my system is off it can drain all the water without issues.
When the pump drains enough the return is exposed to air it breaks it. The sump has at least 10” more to support any additional drainage after it is all done siphoning.
how do you have your 2 return pumps running? i thought about doing that as well for my 50 gallon one for just return and the other for accessoriesI run two return pumps as well....redundancy is a good thing