This Alkaline PH filter for Reverse Osmosis systems is an inline cartridge with mineral balls & calcite media. The alkaline filter improves the PH value of the RO water which could be slightly acid after the reverse osmosis process. It also gives back healthy minerals such as ionized calcium, magnesium, sodium, potassium ion, which were taken away during the water purifying process. This filter is capable of increasing the PH value of the RO water by 0.5 to 0.8, which helps minimize the fluctuations of your body's pH. The minerals from the alkaline filter are natural calcium, magnesium, sodium, potassium ions, which can be absorbed 100% by the human body. These ions are structurally smaller molecules which helps the body take in more water and replenish lost water quickly. It also makes the water cleaner and healthier. Improves the quality of clean water by adding necessary minerals for better health, such as Calcium, Magnesium, Sodium, Potassium and others readily found in natural mineral water. Typically installed with RO systems to complement their absolute filtration quality Filter life: 6 months or 1500 gallons, whichever comes first