Check Valve?

[titus]

Hello,

Yeah I'd not be able to sleep if my overflow runs up through the bottom of the tank, without any check valves or siphon breaks.

I'll trust siphon breaks more so than the check valves (which may not close 100%). But then you also may have siphon breaks with holes that gets clogged up. So you have to be careful in your design.

Titus