Siphon on return

[cba191]

I have dual returns and was wondering about siphons. I've seen people recommend against check valves and others drill a small breather hole to break the siphon. What is best? And if I were to drill, where would i drill the hole.

 

[tsharpe291]

you can drill a small hole on top of the 90

 

[cba191]

you can drill a small hole on top of the 90

that won't spray everywhere?

 

[tsharpe291]

oh yea I was thinking drain not return

 

[mook1178]

I did neither. I just made sure that my dump wouldn't over flow when the return is off

 

[sgdnycct]

You can drill it at a 45’ angle aiming downward into the tank or raise the return outlet just below the water level so it breaks the siphon more quickly.

 

[SantaMonica]

If drilling a hole, I think it goes on the bottom of the elbow on the horizontal section, so that water continuously sprays into the tank.