The phosphate filter is a compact chemical filtration chamber for aquarium use. It can be installed in line with any standard canister filter, or via a seperate pump. The phosphate filter contains 1 liter of Antiphos. This reduces the level of phosphate and thereby curtails the growth of filamentous algea. Depending on the phosphate level, one filling of Antiphos may be sufficient for an aquarium up to 100 gallons for between four and twelve weeks. The phosphate filter can be used for frest and salt aquaria. Dimensions - total length is 14 inches and the diameter is 3.2 inches.