The Omnipure K-Series K2585 inline filter is an All phosphate inline filter. This filter can go in ice makers, refrigerators, beverage equipment, drinking fountains, under the counter systems, R.O.Systems and in conjunction with purification systems. This type of filter is used for scale and corrosion inhibition. Additional Details ------------------------------ Product description: The Omnipure K-Series K2585 inline filter is an All phosphate inline filter. This filter can go in ice makers, refrigerators, beverage equipment, drinking fountains, under the counter systems, R.O.Systems and in conjunction with purification systems. This type of filter is used for scale and corrosion inhibition.