A.O. Smith RO Membrane Replacement Reverse Osmosis Under Sink Replacement Filter - Item # 12231966 | Model # AOS-HERO-S2

A.O. Smith RO Membrane Replacement Reverse Osmosis Under Sink Replacement Filter - Item # 12231966 | Model # AOS-HERO-S2

• Get clean, healthy water by reducing 90 contaminants including chlorine, chloramine, lead, pesticides, PFOA/PFOS, cysts, microplastics, and more

• Replacement filter for the AO Smith Clean Water Reverse Osmosis System (AOS-HERO-CHR)

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

What our Experts Think

• Essential stage 2 RO replacement membrane: This genuine A.O. Smith reverse osmosis membrane restores your system’s core contaminant‑removal performance when the original membrane nears end of life. It’s designed specifically for A.O. Smith under‑sink RO systems (e.g., AOS‑HERO‑CHR).

• Maximum contaminant reduction: Engineered to reduce up to ~99% of up to 90 harmful contaminants, including lead, mercury, pesticides, chlorine, cysts, PFOA/PFOS and pharmaceuticals for cleaner, better‑tasting drinking water.

• NSF‑certified performance: Tested and certified to NSF/ANSI Standard 58, ensuring the membrane meets industry standards for reverse osmosis contaminant reduction.

• Designed for annual replacement: With typical life of about 12 months, replacing this membrane annually helps maintain high water quality and consistent flow from your RO system.

• Under‑sink compatibility: Sized and built for under‑sink installation, it integrates seamlessly with your existing RO system without major adjustments.

• Simple swap‑out installation: Quick membrane change lets you refresh your system’s performance without needing specialized tools or professional help.

Q&A

Q: What is this product used for?
A: Designed to replace the RO membrane in A.O. Smith reverse osmosis under-sink systems, ensuring continued purification of drinking water.

Q: What contaminants does it remove?
A: Helps reduce dissolved solids, heavy metals, chlorine, and other impurities, improving taste and water quality.

Q: How often should the membrane be replaced?
A: Typically every 2–3 years, depending on water quality and household usage.

Q: Is installation difficult?
A: No. Easy DIY installation with clear instructions, designed to fit directly into compatible A.O. Smith RO systems.

Q: Is it compatible with all A.O. Smith RO systems?
A: Compatible specifically with A.O. Smith Hero and other designated RO under-sink systems.

Q: Does it affect water flow?
A: Properly installed, the replacement membrane maintains normal flow rates and optimal filtration performance.

Q: What is included in the package?
A: One RO membrane replacement cartridge.

Maintenance Tips

• Replace membrane regularly: Change the RO membrane every 12–24 months or when water output slows or taste changes.

• Flush after installation: Run 2–3 gallons of water through the new membrane to remove loose carbon and activate filtration.

• Check pre-filters: Replace sediment and carbon pre-filters on schedule to prevent membrane clogging and extend life.

• Inspect for leaks: Periodically check tubing, fittings, and connections under the sink to ensure tight, leak-free installation.

• Maintain clean housing: Wipe filter housing and area under the sink to prevent contamination and ease future maintenance.