Best check value?

chipmunkofdoom2

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I vote "none" as well. Your plumbing should be set up so that only a very small amount of water can ever drain back into the sump when the return is shut off.

In 15+ years of reefing, I've only ever seen once instance where a check valve made sense.
 

DivingTheWorld

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I used a Spears True Union Check valve on my tank and it failed the very first time I shut off my pump. Don’t bother. Just plan to have your sump large enough to contain the additional water.
 

CamD

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I agree, size your sump to contain additional water. If you absolutely require one then a Y check valve that can be easily cleaned/serviced would be the best option IMO, though more costly.

For example, something like this.

1594662780343.png
 

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