USA Made. Total filters: 4 plus 75 GPD membrane; 1-st stage: Inline Sediment Filter 2"x10" 5 Micron, Made in Taiwan; 2-nd stage: Inline Granular Activated Carbon T28 Carbon Pre-Filter 2"x10", NSF Certified, made in USA.
3-rd stage: 75 GPD Membrane, made in USA; 4-th stage: Inline DI Mixed Bed Filter 2"x10", NSF Certified, made in USA; 5-th stage: Inline Granular Activated Carbon T33 Carbon Filter 2"x10", NSF Certified, made in USA.
Fit most of portable (countertop) Reverse Osmosis Systems with 1/4" connection
Replacement Set for Portable Universal 5-stage Reverse Osmosis RO Purification Water System with DI Deionizing Mixed Bed 0PPM postfilter