Gravity feed from internal overflow
down to bottom side of wet/dry - flows up thru mechanical filter
spills over into drip tray and goes bio-bale media.
Below bio-bale in the sump area, there is an inlet and outlet to the Fluval
Before water returns from Fluval back to sump area it goes thru UV light
2nd pipe coming down next to return pump is new water feed from
aging tank.
It's all gravity fed from the overflow. Return pump stops and whole
system will stop, no chance of runaway siphons.
http://www.plantedtank.net/forums/di...-overflow.html
