Quote:
Originally Posted by FishyFishy!
I think that the flow in the 'trickle' overflow would be so minimal that it would create a dead zone. It would be nothing but a nirate factory over time. Mind you, there are ways around that I guess (keeping the water moving/circulating), but they are more of a PITA than anything else.
The most probable scenario here would be to make two durso's with seperate drain plumbing. Same could go for Herbies, it would just be a little harder to fine tune. Get rid of the 2-into-1 valve there, and just make two different drain pipes into the sump.
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If you made each overflow have a full siphon there would be no detritus buildup and full surface skimming. they could have strainers and be at bottom of overflow, (no stand pipe). there would be good water turnover and any detritus would end up in the sump/skimmer.
if the return pump ever failed you would only need enough volume in the sump to handle the volume of the overflows