APEC FILTER-MAX-ESPH 75 GPD Complete Replacement Filter Set for ESSENCE Series Alkaline Reverse Osmosis Water Filter SystemAPEC Essence 75 GPD pH 6 stage complete filter set is made with high quality filtration components to protect and prolong the lifespan of your reverse osmosis system. Premium quality filter set lasts over 6 months for high performance contaminant removal, while the membrane and post carbon filter last 2-4 years. The 6th stage pH+ inline filter enhance the pH of water and adds food grade quality calcium carbonate into the water. Compatible for APEC 75 GPD Essence ROES-PH75 under the counter reverse osmosis systems.1st Stage: Sediment removal 5 micron 10" filter —removes dust, particles, and rust. Protects and extends the life of the membrane and system.2nd and 3rd Stage: Carbon block 10 micron 10” filter —gets rid of unpleasant chlorine, tastes, odors, cloudiness and colors. Also removes VOCs and other common chemicals from the water.4th stage: high rejection 75 GPD TFC reverse osmosis membrane. Removes a wide variety of contaminants including arsenic, chlorine, lead, fluoride, chromium, radium and more.5th Stage: Coconut Shell Refining Carbon 10" filter —removes any possible residual taste from the tank.6th Stage: 10" High Purity pH+ Calcium Carbonate Alkaline Inline Filters with Quick Connect—increases pH level of the water by adding calcium carbonate mineral back into the waterAbout APECFor over 20 years, APEC has been an industry leading manufacturer who specializes in high performance RO systems. As the original manufacturer, we have dedicated a knowledgeable and sincere team that is committed to providing customer satisfaction in hopes to bring many years of enjoyment and good health for you and your family.APEC Water does not distribute or sell our products to any 3rd party sellers on Amazon. Please purchase genuine APEC Water products from Amazon or APEC Water directly for authenticity.APEC Water Systems Set 3 Pcs 3.5" O.D. Replacement O-Ring for Reverse Osmosis Water Filter Housings, BlackThe O-RING-SET contains 3 pieces of 3.5 in. O.D. standard industry size O-RING use to prevent leaks when customer need to change 3 pre-filter of 10 in. standard under sink reverse osmosis system. Recommend to change all O-RINGs once open the housing. Lubricate with clean lubricant and place in grooves below thread to prevent water leaks. APEC Water Systems does not distribute or sell our products to any 3rd party sellers on Amazon. Please purchase genuine APEC Water system product in “new” condition from Amazon.Com or APEC Water directly for authenticity. depending on factors such as use of product, where the product was purchased, or whom you purchased the product from..