Brondell RF-40 Membrane Water Filter Replacement for Circle Reverse Osmosis Filtration System – Every Drop Matters



Taste the difference clean water makes with the Brondell RF-40 Membrane Water Filter Replacement. This high-quality reverse osmosis membrane is designed specifically for the Brondell Circle Under Sink Water Filter System (sold separately) and provides up to 2 years of crisp, refreshing water right from your tap. No more buying bottled water or filtering pitchers – this filter brings the water purification plant right to your home.

Crystal Clear Water That’s Great Tasting and Contaminant-Free

The Brondell RF-40 membrane efficiently separates out sediment, chlorine taste and odor, heavy metals, fluoride, arsenic, cysts, industrial chemicals, and more. Over 64 different contaminants are reduced through a multi-stage filtration process that mimics nature’s hydrologic cycle. The end result is water as pure and crisp as an artesian spring.

You’ll notice the difference from that very first glass. Water tastes sweeter and lighter without any chlorine aftertaste. Your coffee and tea will have richer, more pronounced flavors when made with filtered water. Even pets prefer filtered water over tap. With this filter replacement, every drop matters.

Certified Filtration You Can Trust

The Brondell Circle system and RF-40 Replacement Filter hold prestigious WQA certification for contaminant reduction. This means the filters have passed rigorous independent testing for reduction of over 64 different contaminants, as certified under NSF/ANSI standards 42, 53, 58 and 372. What’s more, this level of certification exceeds the standard for most popular pitcher and faucet filters.

You can trust that this under sink system provides maximum contaminant reduction for safer, healthier water. All materials used in the filter housing and media are FDA CFR-21 compliant, meeting strict standards for food grade materials. Let the Brondell Circle system with RF-40 filter give you peace of mind with every glass.

Long Filter Life & Easy Maintenance

While most pitcher and faucet filters need replacement every 2-3 months, this membrane filter lasts a full 6 months or 300 gallons. With fewer filter changes, you’ll save both time and money. The quick twist and seal design also makes replacement incredibly simple – no mess, no tools required. Just give a quarter turn to release the old cartridge and insert the new. An integrated LCD filter life indicator even tracks your usage and flashes when it’s time for a new filter.

As an added bonus, the RF-40 includes the replacement 3V lithium battery needed for the filter life indicator. Simply switch out the old battery at the same time you replace the filter. With only an annual battery change, upkeep is minimal.

Model Number & Replacement Information

  • Model Number: RF-40
  • Replaces previous Brondell RF-33 filter
  • Designed for exclusive use with the Brondell Circle Reverse Osmosis System
  • Not compatible with any other reverse osmosis system


  • Dimensions: 11.6 x 5.3 inches
  • Weight: 2.65 lbs.
  • Micron Rating: 0.0001 microns
  • Replacement Frequency: Every 6 months or 300 gallons
  • Operating Pressure: 50-100 psi
  • Operating Temperature: 40-100°F
  • Replacement Battery Included: 3V lithium coin cell

What’s In The Box

  • 1 RF-40 Membrane Filter Cartridge
  • 1 3V Replacement Battery for Filter Change Indicator

Comprehensive Contaminant Reduction

This NSF certified filter reduces the following contaminants:

  • Lead
  • Arsenic
  • Fluoride
  • Nitrates
  • Chlorine & Chloramine
  • Radon 222
  • Cysts such as Cryptosporidium and Giardia
  • Heavy metals like mercury, cadmium, and copper
  • Herbicides, pesticides, insecticides
  • Industrial solvents & chemicals
  • VOCs – volatile organic compounds
  • MTBEs & TCEs – gasoline additives
  • PCBs & THMs
  • Hardness minerals such as calcium and magnesium
  • Sediment & particulate
  • Bad taste & odor
  • Bacteria
  • Algae
  • Mold & fungi
  • And much more!

Invest in clean, healthy water for your home with the Brondell RF-40 Membrane Replacement Filter. Superior contaminant reduction and refreshing taste – this is water as it should be.


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