Made in USA. Total filters: 4
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: Inline Omnipure Granular Activated Carbon T33 with 1/2 lbs KDF-55 media, 2"x10", NSF Certified, made in USA. This is the best filter if your water has a pH level of 6.8 or lower. Physiological disease is almost always the result of too much acid stressing the body's pH balance. 5th stage: Inline K2548BB Omnipure Calcite (Acid Neutralization - pH raise) filter, 2"x10", NSF Certified. Increases pH level from 6-7 pH to 8-9.5 pH.
Replacement filter set for Premium Calcite (raise water pH to 9) 5-stage Portable Reverse Osmosis Revolution RO Purification System with super KDF-55/T33 postfilter, 75 GPD