Watts Premier WP531160 RO Pure Plus Reverse Osmosis Water Filter Replacement Kit, Multi, 4 PackWatts Premier RO Pure Plus Reverse Osmosis Water Filter Replacement Kit provides a complete replacement supply of filters for your RO Pure and Pure Plus reverse osmosis systems. The VOC post-carbon filter (WP105381) is a premium high capacity carbon block filter formulated specifically for the reduction of VOCs like MTBE's, atrazine, benzene, 2,4-D, and lindane. Why use a VOC filter? It is estimated that VOCs are present in one-fifth of the nation's water supplies. These water contaminants can enter ground water from a variety of sources including localized use of gasoline or oil spills, leaking underground fuel tanks, septic system cleaners, and chemicals used in the dry-cleaning industry. This replacement filter kits includes: one WP105311 - 11" sediment pre-filter (red), one WP105351 - 11" carbon pre-filter (yellow), one WP105331 - 11" 50 GPD membrane (green), and one WP105381- 11" VOC post-carbon filter (silver/fold). Premier RO-Pure Plus filters change out with a push button release and will not fit Watts Kwik Change RO units, that requires a 1/4" turn. This 4 pack of filters has the perfect amount of filters in order to help you maintain crystal, clear, great tasting drinking water with your Watts Premier RO Pure / Pure Plus Water filtration system. It is recommended to change our your sediment and pre-carbon filters every 6 months. Your membrane every 2 to 5 years depending upon the quality of your incoming water supply and usage. The VOC carbon filter should be replaced every 12 months.This 4 pack replacement filter kit only works with the RO Pure Plus and Zero Pure Plus Reverse Osmosis Systems. It will not fit the Watts 1/4 Turn Kiwk Change (WQC4RO13) Reverse Osmosis System. This 4-Pack of filters has the perfect amount of filters in order to help you maintain crystal, clear, great tasting drinking water with your Watts Premier RO Pure Water Filtration System. It is recommended to change our your Sediment and Pre-Carbon Filters every 6 months. Your membrane every 2 to 5 years depending upon the quality of your incoming water supply and usage. The VOC Carbon Filter should be replaced every 12 months.Watts Premier WP560060 RO Water Filtration PH Balancing Ceramic Filter with 1/4 inch QC Fitting, 1 Count (Pack of 1), MultiWatts Premier 560060 11-1/2 pH Balance Ceramic Filter 1/4 QC. Watts Premier 560060 11-1/2 pH Balance Ceramic Filter 1/4 QC Watts Premier 560060 11-1/2 pH Balance Ceramic Filter 1/4 QC The Watts Premier 560060 11-1/2 pH Balance Ceramic Filter is composed of functional mineral that not only help increase the pH in the water at a consistent level but will also improve the water taste by releasing healthy minerals like calcium and magnesium into your water. This filter contains multiple filtration stages including far infared mineral stones re-mineral phase and pH phase providing perfectly balanced proportions of enriched minerals necessary for healthy great tasting water. These layers include: Sediment filter to reduce any silt sediment or particulate Mineral filter designed for a balanced slow release of calcium and magnesium pH balancing alkalinization through specially formulated alkaline ceramic media Activated ceramic phase for Far-infared release and activation of the water Coral media for pH balancing mineral extraction and improved taste Final sediment filter The Watts Premier 560060 11-1/2 pH Balance Ceramic Filter contains the filter and two 1/4 QC union fittings. The filter should be placed after the membrane and before the holding tank on your reverse osmosis system. The pH Balance Ceramic Filter should not be used as a stand alone filter. The more contact time that the water has with the media the more effective the filter will be at producing alkaline water. Note: The inlet connection is the outer fitting and the outlet is the center fitting. 105376 F560060 Watts Premier Alkaline Ionized Water Filters.The Watts Premier pH Balance Ceramic Filter is composed of functional mineral that not only help increase the pH in the water at a consistent level but will also improve the water taste by releasing healthy minerals like calcium and magnesium into your water. This filter contains multiple filtration stages including far infrared mineral stones re-mineral phase and pH phase providing perfectly balanced proportions of enriched minerals necessary for healthy great tasting water. These layers include: Sediment filter to reduce any silt sediment or particulate Mineral filter designed for a balanced slow release of calcium and magnesium pH balancing alkalization through specially formulated alkaline ceramic media. Activated ceramic phase for far-infrared release and activation of the water coral media for pH balancing mineral extraction and improved taste. The filter should be placed after the membrane and before the holding tank on your reverse osmosis system. The pH Balance Ceramic Filter should not be used as a stand alone filter. The more contact time that the water has with the media the more effective the filter will be at producing alkaline water. Note: The inlet connection is the outer fitting and the outlet is the center fitting.