APEC Water Systems FILTER-MAX90-38 US Made 90 GPD Complete Replacement Set for Ultimate Series Reverse Osmosis Water Filter System with 3/8" D Tubing Quick Dispense , WhiteAll US made super high capacity filters1st stage: high-grade 10 inch high-capacity polypropylene sediment filter -removes dust, particles, and rust. 100% pure polypropylene depth filter with exceptional dirt-holding capacity translates to longer life and fewer change-outs than existing string-wound or resin-bonded filters.2nd and 3rd stage: premium extruded carbon block 10 inch -gets rid of unpleasant chlorine, tastes, odors, cloudiness and colors. Also removes VOCs and other common chemicals from the water.4th stage: high rejection 90 GPD TFC reverse osmosis membrane. Removes a wide variety of contaminants including arsenic, chlorine, lead, fluoride, chromium, radium and more. 5th stage: advanced coconut shell refining carbon 3/8 inch quick connect - TCR (Total Contamination Removal) filter removes any possible residual taste from the tank.For over 20 years, apec has been an industry leading manufacturer of high performance ro systems.APEC Water Systems does not distribute or sell our products to any 3RD party sellers on Amazon. Please purchase genuine APEC Water Systems product in "new" condition from Amazon.Com or APEC Water Systems directly for authenticity.Manufacture warranty may not apply in all cases, depending on factors such as use of product, where the product was purchased, or whom you purchased the product from. Please review the warranty carefully and contact APEC Water Systems if you have any question.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..