[untamed]

Originally Posted by Todd

I think that this mod is limited in its ability to quiet things down because:

In order to have the 'back up' drain work, the top of it would have to be lower then the high water level in the skimmer box - in order for it to flow as water level rose. Meaning that you would have to have your water level in your overflow box lower then normal. Thus alot of the benefit to having a quiet drain would be removed because you would have a louder overflow.

That's true. If the water falls very far in your overflow box, it can make noise. Also, if the water falls too far, it can push air bubbles into your primary drain, which also causes noise. However, if you tune the Herbie to it's optimum, you would have the overflow box water level right at the emergency level. In fact, if some water trickled down the emergency that would be nearly perfect.

That would have the water line much higher than I've drawn it. Some testing would be required to get the emergency overflow at exactly the best height.