Aqua Pure in-line AIMRO Filter AIMRO Trace Element Enrichment Filter, 2″x10″ Ideal as the final stage in any reverse osmosis system, it enriches water with essential minerals and trace elements such as calcium, magnesium, potassium and sodium while raising the ph. Its main features: It enriches the water with the necessary mineral salts and trace elements. pH adjustment Improves the taste of osmosis water. Operating Pressure: 6 bar (90 psi) Minimum Temperature: 2 °C (35ºF) Maximum Temperature: 45 °C (113 °F) Replace every 6-12 months, depending on use