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BOROUX foundation.™ filters


Boroux foundation. filters are compatible with popular water filtration systems. They ensure years of reliable service with a lifespan of up to 5,000 gallons per filter (10,000 gallons per pair). The filters, equipped with Stem Saver technology, are reinforced for added durability during handling and cleaning.

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Key Features

The BOROUX foundation.™ filter is meticulously designed to seamlessly integrate with most gravity-fed water filtration systems including Berkey®, ProOne®, Alexapure Pro, Doulton, Patriot Pure Ultimate, and more. Whether it's refreshing your existing setup or initiating a new journey in water wellness, the filters have been crafted for broad compatibility with gravity-fed systems.

Full compatibility details here

Product information

We offer free shipping on all orders over $60 to all 50 U.S. states.

Boroux encourages customers to test products once they are received. For this reason, we accept returns of products in new or used condition. If you are not satisfied with the purchase for any reason, within 60 days of receiving the package, please get in touch with Customer Service.


The lowercase styling of 'foundation.' in our name speaks to the inherent simplicity of Boroux. By choosing 'foundation', we reflect the straightforward and essential nature of our water filtration solutions—designed to be uncomplicated and accessible.


The period at the end of "foundation." symbolizes finality and completeness. It's a subtle way of saying that Boroux foundation. is the definitive answer to water filtration needs. It's a complete solution, and there's nothing more to add – it's the final word in water filtration.


Just as the name "foundation." is grounded (with the period acting as an anchor), Boroux is grounded in nature and its commitment to the environment. The name resonates with the brand's dedication to being a reliable foundation for filtered water solutions.

Rigorous Performance, Verified Data

Each filter created is a testament to a firm commitment to transparency. Undergoing meticulous testing procedures, the filters come with verified performance data that guarantee you receive water filtration you can count on. This product was designed exclusively to enhance municipal tap water. With each drop filtered, rest assured, you're enjoying the pinnacle of water filtration.

Reinforced Stem Saver™ Design

Recognizing the challenges of filter handling and maintenance, the BOROUX foundation.™ have been re-engineered with the innovative Stem Saver™. This advancement fortifies the most vulnerable part of the filter—its stem—against breakage, ensuring it can endure the rigors of regular cleaning and handling.

Uncompromising Quality, Direct to You

The BOROUX foundation.™ stands out by offering premium filtration directly to your doorstep. Eliminating middlemen ensures that each filter is a blend of top-notch quality and value. This direct-to-consumer approach provides superior hydration without the premium cost.

Designed for Universal Fit

Our filter is meticulously designed to seamlessly integrate with most gravity-fed water filtration systems. Whether it's refreshing your existing setup or initiating a new journey in water wellness, the filters have been crafted for adaptability.


Filter Capacity   Up to 10,000 gallons per pair depending on the quality of the influent water.1
View test results here.
Dimensions 2.75” x 2.75” x 9.75”
Composition Filters are comprised of a specialized blend of activated carbon. The Boroux foundation filters contain silver, an antimicrobial agent, to prevent microorganisms from degrading the product itself. This filter is not intended to filter microorganisms.

Fits most gravity-fed water filtration systems and fluoride filters.

Warranty Coverage  BOROUX foundation.TM filters are protected by a 1-year quality warranty. For further details on our warranty provisions, please contact customer support.
Maintenance  Scrub the BOROUX foundation. filters every 3-6 months. Using an abrasive scouring pad, carefully scrub the surface of the filters for several minutes. DO NOT use soap or detergents on the filters. Re-prime the filters, install, and perform the red dye test to ensure proper installation of the filters. 
Replacement Filter  BOROUX foundation.TM filter / Model BX·FND9·2
Box Includes
  • Two BOROUX foundation. filters
  • Blue Silicone Primer
  • Red Dye Test Solution
  • Tan Priming Button
  • Product Insert

1-Based on independent testing for the reduction of chlorine at 5,000 gallons per filter. While testing was performed under standard laboratory conditions, actual performance may vary. The contaminants or other substances removed or reduced by these filters are not necessarily in all users' water. Filter performance may vary based on local water conditions.

Compatible Water Systems

The BOROUX foundation.™ is designed with versatility in mind, fitting seamlessly with a range of systems. Below is a list of popular systems the filters fit in.

System Model
Berkey® Travel Berkey®
Big Berkey®
Berkey Light®
Royal Berkey®
Imperial Berkey®
Crown Berkey
AlexaPure® AlexaPure Pro®
Aquacera® Terra2
Doulton® PioneerTM SS4
Patriot Pure Patriot Pure Ultimate
ProOne® Big+
Big II
Waterdrop®  Waterdrop® King Tank

Don’t see your system listed? We’re here to help determine compatibility. Your feedback helps us expand our list of compatible systems. If you don't see your filtration system model, please send us an email at with the make, model, filter housing dimensions, and any other important specifications.

Frequently Asked Questions

How long do the filters last?

The filter lifespan will vary depending on the source water and contamination level. The recommendation for when to replace depends on several factors. For example, for filtering chlorine, the filters last for 10,000 gallons per pair. See recommendations for other contaminants.

How do the filters work?

Boroux foundation filters work by absorbing and trapping contaminant molecules. The carbon attracts and absorbs molecules with a certain chemical charge. They stick to the carbon, like how a magnet attracts metal. The tiny pores of the carbon block are so small that they physically block and trap tiny particles. It's similar to a sieve or strainer.

What is the Boroux filter made of?

A specialized blend of activated carbon.

More FAQS here

Customer Reviews

Based on 149 reviews
Gary Krajci (Vermilion, United States)
Customer Friendly

These filters are "the bomb"! Individually wrapped, the kit includes red dye for testing and a blue adapter for priming the filters. Outstanding! The quality of the filtered water is very good. Worth the money. Th9is company treats their customers well.

We are so happy to hear that you are pleased with the new BOROUX foundation. filters! Thank you so much for choosing us to be a part of your family's water filtration journey!

Taylor Krug (Nashville, United States)
Fabulous product

From the packaging to the product itself, high-end from start to finish. The filter itself was super easy to install and the instructions made for it to be simple. Thank you Boroux!

Thanks so much for the kind review. We're so glad to hear that you're enjoying the quality of the filters and had an easy time putting them together! Thank you for selecting us to be a part of your water filtration journey! Don't hesitate to reach out if you have any questions!

Karen Lashley (Bessemer, United States)

Very pleased with filters and their quality

Thank you so much for the feedback! We love to hear that you are enjoying the filter quality and hope you enjoy the water quality for years to come! Thanks for taking us along in your journey for water filtration! Let us know if you have any questions or concerns!

Carol Crawford (Fair Grove, United States)

Great filters

Thanks for the review! We're so happy to hear that you're enjoying the filters! Thank you so much for choosing us to be a part of your water wellness journey! Don't hesitate to reach out if you have any questions!

John G. (Athens, United States)
Excellent filtering system.

System works well with Florida water, if you have experienced that taste before. We also use in Georgia.

Thank you for the review. We're so happy to hear that the BOROUX foundation. filters are working in your system for your water needs! We hope to be a part of your water filtration journey for years to come! Please don't hesitate to reach out if you have any questions or concerns!


Our Story

Building on the legacy of 25 years in the water filter industry, Boroux emerges as a beacon of our commitment to holistic health, personal empowerment, and environmental stewardship. Every drop we filter is a testament to our innovative spirit, ethical dedication, and transparent practices that set new benchmarks. With Boroux, hydration takes on a deeper meaning—it's a journey of enhanced well-being, driven by superior quality, cutting-edge technology, and respect for our planet. Our brand resonates with these values, mirroring our aspiration to uplift lives while cherishing the world we inhabit and maintaining open communication with our community.

Learn More About Us


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