How to stop Sump Drain Gurgle?

[GMGQ]

I use the herbie method. It works Beautifully.

I use it in my overflow box.



So on that drain where the rolled up gutterguard is, at the bottom, there is a gate valve that chokes back the flow until there is no gurgling. The gurgling is from the drain sucking down air. Once it's choked back, it's more like a syphon with no air sucked down. Therefore, no noise!

Originally Posted by fkshiu

If you've got an overflow with 2 bottom drains (e.g. AGA Megaflow), there's the "Herbie" method from RC. It's essentially 2 vertical standpipes in the overflow, one taller than the other. The shorter standpipe flows down into the sump through a gate valve which is adjusted so that the overflow water level is at a height between the shorter and taller standpipes. Don't have the link with me now, but by all accounts it's dead silent.