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This extra large sponge filter works as a biological filter and clarifies water through solids capture. A nice filter for small ponds, water gardens and fish holding tanks. The reticulated sponge is 9" x 9" x 9" and is easily cleaned or replaced without tools. The 20" tall PVC chimney is sealed at the bottom and can be shortened if needed.
Requires .25 cfm of air to operate and 1 lb of weight to submerge it (pour a cup of sand or gravel down the chimney). Includes 20' of 1/4" I.D. tubing and an ALS3 diffuser. Made in USA.