I have a dual overflow, so one overflow drains into two 4"socks and the other one drains right into my skimmer. It is a pain to clean them out every 3 to 4 days but i like how it keeps my water crystal clean and eliminates alot of micro bubbles in my sump. Overall, my sump stays very clean since the skimmer cleans out most of the water drained into it but still pulls out tons of gunk.
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