AO Smith Membrane & Remineralizer Replacements for AO-US-RO-4000 The smallest filter with a

The smallest filter with a separate faucet that provides high quality water purification at an affordable price

The WaterBoss Model 700 Water Softener is built to give whole-house efficiency

It improves drinking water and cooking water taste

Replacements made easy - no plumber necessary

RO Membrane and Remineralizer last approximately 12 months

AO Smith Membrane & Remineralizer Replacements for AO-US-RO-4000 The smallest filter with aReplacement RO Membrane & Remineralizer for AO Smith 4 Stage Reverse Osmosis (AO US RO 4000) Product Features: Replacement RO Membrane & Remineralizer for: The Clean Water Filter with RO Boost (AO US RO 4000). Use only certified, genuine AO Smith replacement filters for continued contaminant removal and system performance. Replacements made easy no plumber necessary. Reverse Osmosis reduces up to 99% of harmful contaminants including lead, fluoride,