Finally hooked the rollermat filter back up. I'm not sure if it will stay in this configuration or not. I wanted to run the entire tank overflow through it but that is too much flow . It's designed to handle about 600 GPH so the main overflow has a drain valve branched off of it so that I can regulate how much goes into the filter and how much just dumps into the sump. This means that only a portion of the return water is getting filtered through the rollermat. I guess some is better than none.