Aries 12" Inline Phosphate filters with Quick Connect contain food grade, slow-melt polyphosphate crystals that dissolve in water to inhibit accumulation of scale and rust in heating, brewing and ice machine applications. Aries Phosphate cartridges are designed for low-flow, point-of-use filtration. This filter is used primarily where scale, corrosion and increased amounts of iron are present in the water source. Phosphate cartridges are also available in combination with coconut shell GAC for added taste and odor improvement.