Made a homade pond filter,cut hole in the bottom of a tupperware square container screwed a aqua tech filter cartridge over the hole with stainless screws,later to become bolts with a little drilling first.I imagine a powerhead would feed water just as the pond pump does.. Probably for indoor use it will need something to catch overflow when it clogs. Maby some pvc or hose through the side at a higher water level. Ill post some pics later but its pretty self explanitory