System is certified by NSF/ANSI Std. 42 & 53; Using IMPACT Technology^ - pharmaceutical grade premium carbon/nylon membrane to achieve filtration capacity of 0.2 micron rating. ^IMPACT: Integrated Membrane Pre-Activated Carbon Technology
Under-the-sink Installation; LED light drinking faucet and LCD cartridge life indicator are included in the system. Monitor usage and provide audio and visual alarm for cartridge change. Twin Cartridge System Design - Prefilter PFS2500-C-CN filter bigger size of particulates which helps to protect delicate carbon block/nylon membrane postfilter in DWS2500-C-CN. Change the cartridge when the water flow becomes slow. Suggest to change cartridge every 6 to 9 months. Cartridge life varies by water consumption and water quality but the maximum life is 12 months only.