One Year Refill Cartridge Kit for 5 or 6 Stage W01 RO Water Filter System (1 PP Sediment, 1 GAC, 1 CTO, 1 Post Filter, 1 RO 50G Membrane + 1 UV Lamp) This is a replacement filter kit for 5 and 6 stage W01 serious RO water filter systems. It includes all the filters that need to be changed regularly on the unit. Filters should be changed on your unit every 6-12 months depending on usage and water quality. We recommend changing them at least once a year to ensure the longest life out of you membrane. Your membrane should last 2-3 years with proper filter changes and maintenance. Package includes: 1 x PP Sediment Filter Build-in filter cartridge with housing and quick fittings To remove sand, silt, dirt and rust particles in water. Replace it every year or 2,000 gallons 1 x BLOCK ACTIVATED CARBON (CTO) Filter Build-in filter cartridge with housing and quick fittings To adsorb the chlorine, organic matter, odor, smell turbidity, and suspending particles. Replace it every 12 months or 2,000 gallons. 1 x GRANULAR ACTIVATED CARBON (GAC) Filter Build-in filter cartridge with housing and quick fittings To adsorb the chlorine, organic matter, odor, smell turbidity Replace it every 12 months or 2,000 Gallons 1 x COCONUT BASE CARBON Filter Inline Water Filter Incorporating coconut grade activated granular carbon for better tasting water. Service Life: 2,500 gallons (9,463L) or 1 year Flow Rate: 0.75 gpm (2.8 Lpm) Temp Range: 40℉-100 ℉ Pressure Range: 30-125psi Maximum Dimensions: 2’’diameter, 10’’length 1 x Reverse Osmosis (RO) Membrane 50G 1 x UV 6w Lamp Payment: PayPal (Preferred) Shipping: Usually 3 – 5 business day delivery including handling time.