ST International AQUARIUM LOW WATER LEVEL FILTER Perfect for Turtle, Snake, Lizard and Fish Tanks In this double filtration system, the Activated Carbon cleanses harmful substances and the Beneficial Bacteria Housing cultivates healthy bacteria that help ecological balance. Gets rid of harmful gases and increases the amount of oxygen by taking advantage of the water vapor effect. ONLY 1.25 inches of water is required! However, this filter works with a variety of aquariums! Energy efficient, DRAMATICALLY effective and SUPER SILENT! SUPERIOR flow control! EFFICIENT water purification! For replacement filter cartridges search ASIN# B00HQPWH62 or B00HQP4382 ALSO perfect for gardening needs ! Filter makes maintanence of table-top/indoor plants easy and helpful!