Kohler Aquifer® 22156-NA Reverse Osmosis Replacement Membrane

Short Description

Upgrade your Kohler Aquifer RO system with this OEM reverse osmosis membrane. It’s engineered to reduce total dissolved solids (TDS), heavy metals, fluoride, arsenic, bacteria, viruses, and more—helping to ensure your drinking water is safe, clean, and great-tasting.

Long Description

The Kohler Aquifer Replacement Membrane (K-22156-NA) is the heart of the Aquifer 4-stage under-sink RO filtration system. This high-recovery reverse osmosis membrane is designed to be the fourth stage in your system, working in harmony with the sediment pre-filter and carbon block filters.

With rigorous internal testing and certifications, this membrane helps reduce arsenic, fluoride, lead, total dissolved solids (TDS), bacteria, viruses, and other contaminants from your cold water supply. It’s built with high-impact plastic and a compact design for seamless integration under your sink. The membrane uses a quarter-turn twist cartridge design, making replacement fast and tool-free. The filter head also automatically shuts off the water supply during cartridge removal to prevent leaks or mess.

To maintain optimal performance, Kohler recommends replacing the membrane every 12 months. This ensures your Aquifer RO system continues delivering the highest-quality water for your family.

Key Features

• High-recovery reverse osmosis membrane for comprehensive filtration

• Reduces arsenic, fluoride, lead, TDS, bacteria, viruses, and more

• Quarter-turn twist-lock cartridge design for easy DIY replacement

• Filter head auto shutoff during removal to prevent leaks

• Constructed with durable, high-impact plastic

• Designed specifically for Kohler Aquifer 4-stage RO systems

• Certified to NSF/ANSI 58 & CSA B483.1, and tested to meet NSF Protocols (e.g. P231)

• OEM part ensures performance and system integrity

Technical Specifications

• Model: K-22156-NA (Aquifer RO Membrane)

• Application: Fourth stage in a 4-stage RO system

• Dimensions: 13-1/16″ (height) × 2-7/16″ (diameter) nominal (approx. 332 mm × 62 mm) Kohler TechComm

• Operating Pressure: 40–100 psi (276–689 kPa) Kohler TechComm

• Operating Temperature: 40–100 °F (4.4–37.8 °C), cold water use only Kohler TechComm

• Certifications: NSF/ANSI 58, CSA B483.1, meets NSF Protocol P231 Kohler TechComm

• Warranty: One-year limited warranty on the membrane (as a consumable) Kohler TechComm

Installation & Maintenance

• Under-Sink Setup: This membrane installs in the designated 4th-stage port of the Aquifer RO system.

• Quarter-Turn Replacement: Twist to unlock the old membrane, pull out, and twist in the new one. The auto shutoff feature in the filter head prevents leaks when a cartridge is removed.

• Change Interval: Replace every 12 months (or sooner if system performance drops).

• Flush & Prime: After installing, flush a few gallons of water through the system to prime and clear any residual membrane fines.

• No Tools Required: Designed for easy DIY replacement without needing a plumber.

Why Homeowners Choose This Membrane

• Essential to Water Quality: With the membrane in place, your RO system can truly deliver purified water by removing dissolved solids that pre-filters can’t.

• Reliable Brand Backing: As an official Kohler replacement part, it preserves your system’s performance and integrity.

• Simple Maintenance: Easy replacements empower homeowners to keep performance optimal without external help.

• Purity & Safety: In combination with the pre- and post-filters, the membrane helps provide water quality you can trust day after day.

Frequently Asked Questions (FAQ)

Q: How often should I replace this membrane?
A: Kohler recommends replacing the membrane every 12 months to maintain filtration efficiency and water quality.

Q: Will this membrane fit any RO system?
A: No. This is specifically designed for the Kohler Aquifer 4-stage RO system. It fits the membrane slot in that system only.

Q: What contaminants does the membrane reduce?
A: It reduces total dissolved solids (TDS), arsenic, fluoride, lead, bacteria, viruses, and other dissolved contaminants when paired with the rest of the Aquifer RO stages.

Q: Can I install it myself?
A: Yes. It uses a quarter-turn twist lock, and the filter head automatically cuts off water flow during cartridge removal—no tools or plumber required.

Q: What if my water pressure drops after installation?
A: Flush the system for a few minutes to prime the new membrane. If pressure remains low, check your pre-filters and make sure they aren’t clogged.