Bottom drain... is it possible or not?

[Miguel Romero]

Hi,

 

I have my own tank using such system (buttom drain) designed by myself. Mine is a freshwater planted tank, and instead of a sump I’m using a pair of cannisters (filters) to lock the flow in case of a shut down of power. Cannisters make a perfect seal (fully locked as a check valve) in case of a shut down of power. Otherwise all water will go down by using a simple sump.