FUNCTION – Alkaline Mineral pH+ Remineralization Filter, adjust Ro water (PH is 5-6) to alkalescent water. PH will be around 7.5-8.5. and add calcium,magnesium,sodium and potassium ions back to the Ro water,Used with Ro systems to complement their absolute filtration qualities.Produces pH-balanced alkaline water STANDARD- Fits most 5 or 6 stage reverse osmosis systems, NOTE:Please flush new filters 15 minutes DIMENSION- Diameter 2″ x Length 10″. inlet/outlet: 1/4″ NPT thread .JUST 2 piece filter in the box. GOOD PACKING- The filter is individually wrapped&sealed well. life time:3-6 months, shelf life:3 years Specification: Feed Water Pressure: 40 – 100 PSI Temperate:40-110°F/5-45°C Shelf life: 3 Years More valuable information: ✪What is dimension of the Geekpure Replacement Water Filters? It is 2″ x 10″ . ✪How to add it on my 5 Stage Ro system? Please consider to buy 1/4” elbow fittings and tubes. ✪If not Geekpure, the filters is available to other brands Ro water purifier? Please don’t worry. it compatible to most Ro system. ✪What is in the box? Just 2 x Replacement Water Filter. Note: 1. The Life Time of the Filter Cartridge is Around 3-6 Months,It Depends on Usage Amount and Feed Water Quality. 2.It Is Recommended to Wait Until the Entire System Is Pressurized (Including Storage Tank & Faucet) and Re-Check for Any Leaks Before Leaving Installation Site.