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.
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