Not directly... however, you can build one using the 10 inch tubes that are part of an RO filter. You can purchase these fittings at homedepot and sometimes even at walmart for abourn 15-30$. You will also need a 5 micron or less (like a 1 micron) insert... they usually run about the same cost as the 'canister'. You will then need some sort of pump to get the water to the canister and tubing to get it back to the tank.Sir_BlackhOle said:Has anyone had success building their own diotom filter? They are so expensive in the stores!