Replacement filter set for 4-stage Alkaline Countertop Reverse Osmosis RO Revolution Water Purification System, 75 GPD, remove fluoride (without membrane)
Total filters: 3.
1st stage: Inline Sediment Filter 2"x10" 5 Micron, made in Taiwan. 2nd stage: Inline Granular Activated Carbon T28 Carbon Pre-Filter 2"x10", NSF Certified, made in USA. Membrane (not include in package - change every 2-3 years).
4th stage: 3-in-1 Alkaline filter, 2"x10". Raise pH level of water from 6-7 pH to 8-9 pH.