System 1 Diatom filters are made by Aquarium Products: go to this site http://www.aq-products.com/Catalog/Catalog%20Frame%20Page.htm then select/double-click "Aquarium Accessories" then Select/double-click "System 1" Scott H. __________________________________________________ Do You Yahoo!? Great stuff seeking new owners in Yahoo! Auctions! http://auctions.yahoo.com