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Enhance the functionality of your legacy system with the BOROUX stand. Its 6 inches height allows easy cup or bottle filling. The non-marking rubberized feet protect your surfaces while ensuring stability.
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The Legacy 3 gallon was designed to be the perfect size for most households. But how many filters do you need?
2 Filter Configuration is ideal for up to 4 people if you fill it once daily (approximately 100 ounces per person). If you refill it multiple times throughout the day, it can serve even more users.
4 Filter Configuration (2x Faster Filtering) is perfect for larger families or up to 8 users, or for those with above-average water use (approximately 100 ounces per person, per day, filled twice daily). This configuration is also ideal if you use filtered water for cooking, watering plants, pets and other household needs.

Set of 2

BOROUX foundation.™ Black Filters

$160 $140 Sale

BOROUX foundation black filters are compatible with popular water filtration systems. They ensure years of reliable service with a lifespan of up to 6,000 gallons per filter (12,000 gallons per pair). The filters, equipped with Stem Saver technology, are reinforced for added durability during handling and cleaning.

HSA/FSA Eligible at Checkout.

Select & Save Options: Set of 2 Filters

Pickup available at 1981 Aspen Circle

Usually ready in 4 hours

Key Features
Compatibility

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 the U.S. and Canada.

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.

chemistry beaker

Lab-Verified Performance

Peace of mind knowing your water is always pristine.

Trusted for 20+ Years

Experience and expertise you can always rely on.

water droplets

Filters Up to 12,000 Gallons

Less frequent replacements, providing more savings.

contact customer service

Dedicated Customer Support

Confidence in making informed decisions about your water.

Advanced Filtration for a Healthier Home

Our state-of-the-art filtration technology doesn’t just filter water; it transforms it. By removing up to 99.97% of harmful contaminants, BOROUX foundation.™ filters ensures your water is as pristine and refreshing as nature intended. Explore the specific contaminants our filters eliminate and learn how each removal enhances your health and well-being.

Heavy Metals Contaminant Removal Up to 99.4%

Heavy metals can enter your water from corroded pipes, industrial waste, and natural deposits. They often go unnoticed but pose significant health risks over time.

Health Risks

Heavy metal toxicity can cause neurological issues, developmental problems in children, and damage to vital organs. Removing these metals is crucial for maintaining overall health.

Common Contaminants
  • Lead (neurodevelopmental issues)
  • Mercury (brain and kidney damage)
  • Cadmium (kidney damage)
  • Chromium (skin irritation and ulcers)
  • Uranium (kidney toxicity)

Disinfection Byproduct Removal Up to 99.7%

While disinfection is essential for killing harmful microbes in water, the process can create byproducts that pose potential health risks commonly found in treated municipal water supplies. They form when chlorine or other disinfectants react with natural organic matter.

Health Risks

Disinfection byproducts can increase the risk of cancer and reproductive issues. Removing these byproducts ensures optimal drinking water quality.

Common Contaminants
  • Trihalomethanes (THMs) (cancer risk)
  • Haloacetonitriles (HANs) (genotoxic effects)
  • Chloramine (respiratory issues)
  • Bromodichloromethane (liver and kidney damage)
  • Chloroform (central nervous system effects)

Industrial Toxins Removal Up to 99.6%

Industrial toxins can enter your water through runoff from manufacturing plants, plastic degradation, and other industrial activities. They are pervasive in urban and industrial areas.

Health Risks

Exposure to industrial toxins can cause a range of health problems including cancers, hormonal disruptions, and organ damage. Ensuring your water is free from these toxins protects your long-term health.

Common Contaminants
  • Benzene (linked to anemia and leukemia)
  • Bisphenol A (BPA) (hormone disruptor)
  • Chlorine (digestive problems)
  • Trichloroethylene (TCE) (liver and kidney damage)
  • Polyfluoroalkyl substances (PFAS) (immune system effects)

Pesticides, Herbicides, Insecticide Removal Up to 99.9%

These chemicals are widely used in agriculture and pest control, but they can also contaminate water sources, posing risks to human health.

Health Risks

Exposure to pesticides, herbicides, and insecticides can increase the risk of cancer, disrupt endocrine function, and cause other health problems. Filtering these chemicals is crucial for high-quality drinking water.

Common Contaminants
  • DEET (neurotoxic effects)
  • Glyphosate (cancer risk)
  • Heptachlor (liver damage)
  • Lindane (nervous system effects)
  • Methoxychlor (reproductive effects)

Volatile Organic Compounds (VOCs) Removal Up to 99.9%

VOCs are chemicals released from household products like paints, cleaning supplies, and solvents. They can easily contaminate water sources and pose a risk to your health.

Health Risks

VOC exposure can cause headaches, nausea, and long-term damage to the liver and kidneys. Some VOCs are known carcinogens, making their removal essential for safe drinking water.

Common Contaminants
  • Chloroform (central nervous system effects)
  • Carbon tetrachloride (liver damage)
  • Toluene (nervous system damage)
  • Xylenes (respiratory issues)
  • Ethylbenzene (kidney and liver damage)

Pharmaceutical Contaminant Removal Up to 99.5%

Pharmaceutical residues, including medications and personal care products, can enter water sources through human and animal excretion, improper disposal of medications, and runoff from pharmaceutical manufacturing.

Health Risks

Long-term exposure to pharmaceutical contaminants can lead to antibiotic resistance and other health problems. Removing these substances helps maintain pristine water quality.

Common Contaminants
  • Estrone (hormonal effects)
  • Ibuprofen (digestive issues)
  • Naproxen (digestive and kidney issues)
  • Phenytoin (nervous system effects)
  • Meprobamate (sedative effects)

Invest in Your Family’s Health and Well-Being.

Choose BOROUX foundation.™ Filters for high-quality, refreshing water.

Shop Now and Safeguard Your Family

Specifications

Filter Capacity  Up to 12,000 gallons per pair depending on the quality of the influent water.*
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.
Compatibility

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

Warranty Coverage  BOROUX foundation 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 filter / Model BX·FND9·2
Box Includes
  • Two BOROUX foundation filters
  • Blue Priming Tool
  • Red Dye Test Solution
  • Tan Priming Tool
  • Product Insert

*Based on independent testing for the reduction of chlorine at 6,000 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
LP4
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 contact@boroux.com 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 12,000 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.

How do the BOROUX foundation filters work?

How do the BOROUX foundation filters work?

What contaminants are filtered by the BOROUX foundation filter?

See the full list and the latest contaminant test results. Testing is ongoing and data is updated regularly.
The BOROUX foundation filter is not intended to filter microorganisms.

Customer Reviews

Based on 354 reviews
92%
(327)
5%
(17)
2%
(8)
1%
(2)
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(0)
K
Karen Hansill (Smyrna, United States)
Filters

Filters easy to install

Thank you for your positive review! We're glad to hear that you found our BOROUX foundation filters easy to install. We strive to make our products user-friendly and we're happy to know that we've met your expectations. Thank you for choosing Boroux! Happy hydrating!

D
Deborah (Las Vegas, United States)
Black replacement filters

Ordering was easy, shipment arrived quickly.

Thanks for your review! We're so glad to hear that placing an order for the BOROUX foundation filters was easy for you and that your shipment arrived quickly. We strive to make the purchasing process as seamless as possible for our customers. Thank you for selecting us to be a part of your personailzed water wellness journey!

A
Anonymous (Suffolk, United States)
speedy delivery

My order of two Black Filters were delivered quickly and were packaged very well. They were bought as extra filters for our Berkey Water Filter system.

We're happy to hear that you received your Boroux foundation Black Filters quickly and that they were packaged well.

D
Donna N. (Shrewsbury, United States)
Black Filters

I have a Berkey and it was time to replace my black filters. With Berkey black filters no longer available I was looking to where I would find compatible filters. Boroux was able to send me two black filters (very quick delivery) and they work beautifully. I'm so glad they are available as my Berkey container is still good to use.

We understand how important it is to find compatible filters, and we're happy to provide a quick delivery to ensure your system can continue to be used. Thank you for your support!

L
Leslie Sanders (Peoria, United States)
Replacement filters

I am pleased with the new filters

Thank you for your review! We're very happy to hear that you're pleased with your new BOROUX foundation filters! Our team is focused on enhancing your water hydration experience and is proud to offer these filters for you. Thanks so much for choosing us to be a part of your personalized water wellness journey!

Our Story

Building on the legacy of 25 years in the water filter industry, BOROUX embraces innovation and ethical practices. We are committed to quality water. Every drop we filter is a testament to enhancing your well-being. Our dedication to better products, better practices, and better communication leads to you getting better water. BOROUX is the clear choice for hydration.

Learn More About Us
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