Brondell RF-40 Membrane Filter Replacement for Circle Under Sink RO – 24 Months

Refresh your Circle Under-Sink RO system with the Brondell RF-40 membrane

Keep your Circle filtration running smoothly with the Brondell RF-40 membrane replacement. Designed to sit inside the Circle Under-Sink Reverse Osmosis setup, this replacement is built to support consistent filtration performance and reliable long-term use.

Crystal-clear benefits you may notice

• Crystal-clear water quality: the RF-40 membrane separates clean water from a wide range of impurities, helping to reduce metals, fluoride, arsenic, cysts, and other industrial chemicals.
• Certified performance: when paired with the Circle RO System, the membrane is part of a WQA-certified setup for contaminant reductions under NSF/ANSI standards 42, 53, 58, and 372.

Simple installation and ongoing maintenance

• Easy DIY installation: a quick twist and seal lets you replace the membrane in minutes, with a change indicator to prompt replacement and an included replacement battery for the indicator.
• Clear maintenance cues: the indicator helps you keep your system performing close to its best, reducing guesswork and downtime.

Designed with sustainability in mind

Brondell’s approach blends practical filtration with a broader commitment to resource-conscious design. Simple upgrades, efficient systems, and products that fit into a sustainable home routine contribute to lasting value and reduced waste.

What to expect in daily use

In everyday scenarios, you may notice steadier water quality and consistent performance from your Circle RO setup. The RF-40 membrane is a replacement part that supports ongoing system effectiveness, without promising specific results for every household.

Specifications at a glance

• Replacement membrane for Circle Under-Sink RO systems
• Designed for a typical 24-month lifespan under normal use
• Includes a change indicator battery for easy monitoring