TAC CARTRIDGE: Rated for up to 250,000 gallons, the Watts Premier TAC (Template Assisted Crystallization) Cartridge is designed to reduce scale formation, providing chemical-free scale reduction and protection and improving efficiency of water used in appliances. HIGH-CAPACITY FILTRATION: This OneFlow Plus replacement cartridge converts hard minerals into soft particles, thereby preventing build-up inside pipes and retaining beneficial minerals like calcium, potassium, and magnesium. EFFICIENT FILTRATION: This cartridge does not add or remove anything from the water and operates without chemicals or salt, promoting sustainable, environmentally friendly water treatment technology and leaving only high-quality drinking water. FOR ONEFLOW PLUS: This cartridge is specifically designed for use with the Watts Premier OneFlow Plus Whole House system. We recommended replacing every 250,000 gallons or 3 years, whichever is earlier. When replacing ensure to turn off the inlet and outlet valves on the system’s supply and outlet lines. 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.