This worked fantastic.<br>Treat water with clorox.<br>Cut the bottom off a 24 ounce gatorade bottle.<br>Add in this order......<br>one coffee filter<br>one "Top Fin" Small filter cartrige from "Top Fin Power Filter 10" (activated carbon for aquariums)<br>one coffee filter<br>1/2 inch sand<br>one coffee filter<br>one paper towel