VOC FILTER REPLACEMENT: Designed for your under sink RO Pure (WP531411, WP531407) or Zero/Pure Plus (WP531517, WP531417), the Watts Premier RO Pure Plus VOC Carbon Block Water Filter is specifically formulated for the reduction of VOCs, filtering particles as small as 1-micron. Please note this product will not fit the Watts 1/4 Turn Kwik-Change RO System. HIGHLY EFFECTIVE FILTRATION: Includes one 1-Micron VOC Filter (WP105381) with a flow rate of 0.5 GPM (1.89 lpm). In addition to removing VOCs this product acts as a final polishing filter to crispen up the flavor and enhance the taste of your water. SMART DESIGN: This 11-inch filter has a silver label and cap to help differentiate it from other filters in the Watts Premier RO system family of filters. It also features a push button release that allows for hassle-free replacement without shutting off the water source. Easily change out with a quick push of a button - no special tools required! QUALITY CONSTRUCTION: This durable filter is crafted from high-quality materials for maximum filtration. Filter life may vary based upon local water conditions or use patterns, but we recommend replacing the VOC filter once a year. THE PREMIER DIFFERENCE: Since our founding in 1989, Premier has been dedicated to the design, development, and marketing of high-quality water filtration systems that exceed industry standards. Following our Watts Water Technologies in 2001, our audience and influence have only expanded, solidifying Watts Premier as a trusted leader in the industry.