yes,the supply line for your sump just after the overflow/skimmer.
a SLIGHTLLY weaker pump will acomplish this for an example say your overflow flows at 310gph a good pump to use would be a 300. Dont forget to account for head for example I have 4 foot of rise from my sump so my pump needs to pump 300gph at 4 foot of head.......its easier than it sounds lol good luck
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