New tank design graphic ... Tell me what you think...

[Megalodon]

Originally Posted by Myka

Your way won't work. If you put gate valve on all three of your lines, then even if only one of them gets clogged you will have a big puddle to clean up!! The point of the Herbie is to be able to use the gate valves to throttle down the drains so there is NO AIR in the drains making them silent (the other end needs to be under water in the sump too). The second drain is for when the first one clogs up, and it will.

The backup overflow doesn't have a gate valve though. And it's higher than the other two. If the first two get clogged up then the third backup overflow, unrestricted, will kick in.