Everpure EV979902 SS-10 ScaleStick Replacement Cartridge Hydroblend compound to inhibit mineral scale deposits and prevent corrosion in water-fed equipment Ideal for use with ice machines and ice applications, but can also be used with office water, coffee and espresso applications It is a more practical and effective scale prevention method than standard phosphate treatments Fits most standard 10-Inch housings The cartridge is translucent, so you can easily monitor your filter's life