[Ultra-long service life] Waterdrop undersink water filtration system has a maximum service life of 8,000, 16,000, 24,000 gallons or 12, 24, 36 months.[ 1] [Innovative multistage filtration] Waterdrop undersink water filter adopts advanced multistage filtration to effectively reduce chlorine, odor, sediment, and other heavy metals, which is tested by the third-party laboratory. [2] [Authority guaranteed materials] Premium lead-free materials are fully certified by the WQA against NSF/ANSI 372 standard. BPA-free materials are also ensured.