Enhance the quality of your water with these Sodium Polyphosphate Balls (SILIPHOS). Designed for all water filter cartridges, these balls use Polyphosphate Filtration Method to prevent the buildup of limescale and other impurities. With a weight of 2.2 lbs. They are perfect for both commercial and household use. These SILIPHOS balls are compatible with all empty water filter cartridges and can be used in a variety of appliances. They are suitable for use in Small and Large Water Filter cartridges for Water Purification & Soda Fountain Machines. Improve the quality of your water for no scale coffee equipment.