AO Smith Reverse Osmosis Water Filter Membrane Replacement - Replacement for AOS-HERO RO Filtration Systems - Filters to Reduce Chlorine & Other Contaminants from Drinking Water - AOS-HERO-S2

• Clean, Healthy Water - Reduce up to 99% of 90 contaminants including chlorine, chloramine, lead, pesticides, PFOA/PFOS, cysts, microplastics, and more from water in your house.

• Advanced Filtration - Replacement membrane indepently tested to NSF standards 42, 53, 58, and 401.

• Use only certified, genuine AO Smith replacement filter cartridge for continued contaminant removal and system performance.

• Stage 2 reverse osmosis replacement membrane for AOS-HERO-CHR (B0CCQF4QZX) systems. Replace every 12 months or 730 gallons whichever comes first.