Check valves question

[BullyBee]

Hey now. I keep reading check valves are not 100%. “Because of this, a ball valve should be used in line.”

Well if check valves aren’t 100% why use them?

 

[35ppt]

Redacted

 

[Saltees]

Never need one. As long as the sump has the capacity to handle the back siphon from the return outlet you’re good. But watch out for skimmer overflowing from the raised sump level though.

 

[naterealbig]

Hey now. I keep reading check valves are not 100%. “Because of this, a ball valve should be used in line.”

Well if check valves aren’t 100% why use them?

I use check valves because I use two rewritten pumps. If one fails, it won't push water back through the other pump.

 

[Crustaceon]

I don’t use them and I have dual return pumps, each with their own individual feed lines. When I shut my pumps off at feeding time, they back siphon until the nozzles in the display suck air. But It doesn’t worry me because my sump can easily handle the additional volume and stops with around 4” of sump above it. If you design your system well, you probably won’t need a check valve, which is good because tend to fail anyways.

 

[jtermini]

I use check valves because I use two rewritten pumps. If one fails, it won't push water back through the other pump.

I am looking to implement the same on my new tank to avoid issues when one pump fails. Any suggestions? What style do you use? Swing or Wye check valve?