APEC FILTER-MAX-ESPH 75 GPD Complete Replacement Filter Set for ESSENCE Series Alkaline Reverse Osmosis Water Filter System APEC Water Essence series FILTER-MAX-ESPH is for ROES-PH75 1st to 3rd stage pre-filters removes dust, particles, rust, chlorine, taste and odor 4th stage high rejection 75 GPD TFC reverse osmosis membrane removes a wide range of contaminants 5th stage standard capacity coconut shell carbon filter removes any last residuals 6th stage 10 inch high purity US made PH+ alkaline calcium carbonate inline filters with 1/4" quick connect