Alright, let the arguments begin. From what I've been reading so far is that one half of aquarists hate em, and the other always uses them.
The reason I'm thinking about a check valve is because I've decided to use a spray bar for my return. Thinking 10" long, 90° elbow going straight down to a drilled acrylic tube with a sealed up end. I don't want to drill the holes right next to the water surface to prevent agitation to minimize gas exchange (co2
loss), so to prevent syphoning when the pump goes off I'm thinking of using a true union swing check valve from marinedepot.com.
What parts actually fail on these, and since its a fw
tank, would that lessen the chance of a failure? Or does anyone have other ideas to break the syphon? Like I said don't want holes near the top. But also I was thinking of drilling a hole in the top of the elbow and inserting and airline into it bent into a U shape so it wouldn't squirt water out and would allow air to get in once the water level drops a bit?
Or would a ball check valve be better?