Straight up outta tha ghetto.
1. Hop in car. Drive to dollarama. Buy a water jug thingy. Something tall n skinny with a removable lid. Drive home. (Don't build it in store, they hate that
)
2. In the lid. Make a hole jus large enuff for a little pump nozzle to fit in.
3. Take some filter sponge, cut to size filter pad, something that will allow water to pass thru but not media, and make large enuff so it snug on the inside diameter of ur water jug thingy.
4. Cut some small slots on a corner OPPOSITE the pump end.
5. Stuff in filter sponge to slot end.
6. Stuff in rowaphos.
7. Stuff another filter sponge in. Near pump end.
8. Screw on lid, stuff pump nozzle into nozzle hole (refer to #2)
9. Now depending on how much of seal u r going for at the nozzle of pump into the lid, and how ghetto u wanna go is up to u... I could suggest a small trip to lowes for $.50 rubber grommet. Put that onto the lid hole and the pump-to-lid snug ratio increases ten fold! R u could slab on some epoxy if that's ur flavour too.
10. Mounting. Dunno. Figure it out.
That or wait till a fellow reefer sells ya a real reactor for cheap....
This is the pinnacle of ghetto rigging a reactor. If there r more terrible ways of doing this, plz feel free to try those too!