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.

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.

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 here.

A specialized blend of activated carbon.

Proudly crafted in the USA! The plastic Stem Saver™ is sourced from China.

Yes. The BOROUX foundation filter was designed to fit in most gravity-fed systems that hold nine-inch filters. The filter stem fits 3/8 inch holes.

No. However, they are compatible with post-style fluoride filters.

Not yet. BOROUX products are currently undergoing testing to NSF standards to achieve certification. In the interim, actual test results can be found here.

The BOROUX legacy system is a gravity-fed water filter. It has one upper chamber and one lower chamber. The foundation filters are installed in the upper chamber. Water is poured into the upper chamber, and then gravity pulls the water down through the BOROUX foundation filters and into the lower chamber. Drinking water can then be poured out from a spigot located at the base of the lower chamber. 

• Reliable performance from the included BOROUX foundation filters. Every system comes standard with two filters assuring peace of mind through trusted technology, backed by real-world, verified testing. 
• Simple design. Sometimes the best innovation and design philosophy is to simplify. The legacy system boasts, seamless one-piece 304 AISI stainless steel chambers with built-in vents to prevent airlocks; a domed low-profile, single-piece lid for a sleeker look and less parts to prevent rusting; and a stainless steel spigot with a ceramic valve for smooth and fast flow.  
• You’re getting more than a product, you’re getting an entire team dedicated to supporting your personalized water wellness journey. We’re here to help you through every step of your journey and have tools in place to best serve your water filtering needs.

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• Chambers and spigot is 304 AISI stainless steel, which is food-grade quality and highly corrosion-resistant. 
• foundation filters are activated carbon blocks 
• Stem Saver, hole plugs are BPA-free food-grade plastic 
• base ring and washers are silicone 

The legacy system is designed in Colorado and made in China at a highly reputable, technologically-advanced factory.

Yes, stainless steel can rust, although it is less likely to do so compared to other types of steel. Stainless steel contains chromium, which forms a protective oxide layer on its surface that helps prevent corrosion. However, if this protective layer is damaged or if the stainless steel is exposed to harsh environmental conditions, such as high levels of humidity or chloride-containing substances, it can still rust. Regular maintenance and proper care can help prevent rusting in stainless steel.

Clean the stainless steel chambers and spigot monthly with dish soap and warm water.

Clean foundation filters every 3-6 month with water and an abrasive sponge.

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BOROUX products come with a 60-day risk free trial. If for any reason, within 60 days of purchase, you are not satisfied with the filters, system, or drinkware you can return them for a full refund.

The BOROUX foundation filters are warranted to be free from defects in material and workmanship for one year from the date of purchase. This warranty does not cover failures resulting from abuse, misuse, alteration, damage, or failure to follow installations and use instructions. If the product is defective, we will replace the product. Proof of purchase, description of product, and alleged defect must be provided for a warranty claim.

The BOROUX legacy system (this includes: chambers, spigot, washers, hole plugs, or wingnuts) is warranted to be free from defects in material and workmanship for a lifetime. There is no need to register; to file a warranty claim, please contact customer service with your order number.

The lifetime warranty does not cover damage caused by carelessness, accidents, abuse, or unintended use of the system. This warranty does not cover filters.

State laws prohibit the sale of consumer water filter products without certain certifications. We are currently working on obtaining those certifications which would then allow us to ship to California and Iowa.