Model MC 601 Poly-Phosphate Filter Attaches directly to your hose Bibb. 5 micron sediment filter with poly-phosphate     element helps keep nozzles clean in areas with hard water. Inlet: ¾" FHT Outlet: ¾" MHT

Polyphosphate is a soluble mineral compound have been used as an alternative form of hard water treatment which acts as a sequestering agent when added to water. Sequestering is simply the ability or tendency to tie up and hold in solution other minerals such as scale causing calcium and magnesium. The polyphosphates form bonds with scale causing minerals which make them more water soluble. Therefore, the hard minerals act soft and remain in solution, as opposed to depositing scale. Polyphosphates also change the shape of the scale causing molecules which does not allow it to cling and prevents it building up on itself and minimize the cloging of nozzles.