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Originally Posted by reef_raf
My understanding on check valves is they'll fail..eventually. All you need is a hole for a siphon break (2 holes is better).
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the ones I use have a min 20 year life span... the old adage, you get what you pay for...
if you do the holes, they can work great, just make sure they dont get cloged too much or they are no good, algae will fill them in, or coraline, or salt crystals depending where you drill