which check valve do you use?

<a href=showthread.php?s=&postid=11045688#post11045688 target=_blank>Originally posted</a> by coralfragger101
I Don't trust any of them and therefore I don't use any.

I agree with this, I have used them all and all have fail at one point or another, IMO you are better of opening a small whole slightly below the surface so that in case of power failure it will leak air in the tube and breaks the siphon.
 
Sorry, still lost where in rr setup would a check valve be used? It is one of those things that i don't have a clue of. I used check valves 15 years ago when undergravel and a air pump were king. Thanks,
 
<a href=showthread.php?s=&postid=11049768#post11049768 target=_blank>Originally posted</a> by db_triggerfish
Sorry, still lost where in rr setup would a check valve be used? It is one of those things that i don't have a clue of. I used check valves 15 years ago when undergravel and a air pump were king. Thanks,
The check valve that you are referring is for the air line to avoid water to reach the air pump. The one that we are talking about is the same concept but to avoid water to be siphon back into the sump in case of power failure they are a bigger version of the one you know.
The reason why this is important is because you could flood your house if the return pipe is positioned all the way to to bottom of the tank and it starts siphoning back the water, your sump will eventually fill and overflow.
I resolved this issue with drilling holes in the return line slightly below the water surface and as a backup I installed an emergency drain in the sump, this is plumb to the outside of the house.
 
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