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The ENERGY STAR® Qualified LG 21.9 Cu. Ft. French InstaView™ Door-in-Door® Counter-Depth Refrigerator, Model # LFXC22596S comes with the LG 6 Month / 200 Gallon Capacity Replacement Refrigerator Water Filter (Part ADQ74793501), Model # LT1000P installed. IT has a built-in bypass filter. If you install a Reverse Osmosis Water Filtration System, the pressure needs to be a minimum of 40–60 psi (2.8 – 4.2 kgf/cm2,or less than 2–3 seconds to fill a cup of 7 oz capacity). If the water pressure from the reverse osmosis system is less than 20 psi or 138 kPa or 1.4 kgf/ cm2(takes more than 4 seconds to fill a cup of 7 oz or 198 cc capacity), check to see if the sediment filter in the reverse osmosis system is blocked. Replace the filter if necessary. If the water pressure remains low, call a licensed, qualified plumber...^IFV
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