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!
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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.
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