Hi, i'm thinking of trying to make my own overflow for a sump. I was looking at some of the post and possibilities of how to go about making my own. Well i came up with an idea, but i'm not sure if it would work and i'll like to know if anyone sees any holes in it before i try. I have a penguin hang on filter that i don't need. Whats to say if i drilled a hole in the bottom of the filter and attached the sump to that. Then i remove the impeller so that there is no obstruction, and cut the inlet pipe short. So that it basically is about an inch or so below the water surface. i'll place some form of a filter to the inlet so nothing gets sucked it, but would that work? it has the basic same design so that water is sucked in though the U tube into what was the filter box and down into the sump tube? well let me know what anyone think and if i'm way off with it or if you have any questions.