Product Description Say goodbye to unpleasant tastes and odors and say hello to fresh water with the Watts Premier RO Pure Plus VOC 4-Pack Filter Kit, a complete set of water filters for your under sink RO Pure (WP531411, WP531407) or Zero/Pure Plus (WP531517, WP531417). The included 3 filters and membrane are tailored for specific filtration purposes, collectively ensuring crystal clear, great-tasting drinking water every time. This comprehensive kit includes one 5-Micron Sediment Filter (WP105311) for reducing dirt, silt, and rust that affects the taste and appearance of your water; one 5-Micron Activated Carbon Pre-Filter (WP105351) for reducing chlorine taste and odors; one 1-Micron VOC (Volatile Organic Compound) Filter (WP105381) for removing DPB, TTHM, and herbicides and pesticides, such as atrazine, benzene, 2,4-D, and lindanes; one 50 GDP Semi-Permeable Membrane (WP105331) for reducing TDS and contaminants like arsenic, lead, nitrates, percolate, and copper, as well as cysts, including Giardia and Cryptosporidium. Our filters are crafted from only the highest quality materials for durability and maximum filtration. Filter life may vary based upon local water conditions or use patterns, but we recommend replacing sediment and carbon pre-filters every 6 months, the VOC filter once a year, and the membrane every 2 to 5 years. Refreshing hydration isn't the only thing that makes these top-performing 11-inch filters stand out; they also feature a user-friendly design, with each filter conveniently denoted by a different color for easy identification: red for sediment, yellow for pre-filter, silver for VOC, and green for membrane. Furthermore, they are equipped with a push button release that allows for hassle-free replacement without shutting off the water source. Easily change out filters with a quick push of a button - no special tools required! Please note this kit will NOT fit the Watts 1/4 Turn Kwik-Change RO System. From the Manufacturer 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.