I will point out the obvious, but one potential issue with back siphon holes is that they can get clogged. And if they do... Just make sure that sump will have enough room for all the potential water that would come down from DT, in case those holes do clog up. I read a story before where snail crawled onto one, plugged it up, and surely enough a bunch of water went all over the floor as sump was overflowing
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