The ROES-PH75 is a 6-stage 75 GPD reverse osmosis water filtration system that adds calcium minerals to enhance the water taste for people who prefer mineral water. This system features a premium mineral cartridge that adds only high-purity calcium carbonate to effectively raise pH in the water for those who desire alkaline water. Other re-mineralization reverse osmosis systems will claim to add various beneficial minerals back into the water; however, their mineral formulations are often from unknown and uncertified sources that can lead to potential health concern. APEC Smart Leak Detector offers reliable protection from anywhere in your home. WiFi connected to push notifications to your phone of potential leaks. App use is not required to sound alarm.