PURE: free of contaminants
+ FAST: at high speed

Our Purefast® is designed to get rid of PFAS in your water in the blink of an eye using DEXSORB® rapid kinetics.

How to Use Purefast® Filter for PFAS Removal

Purefast® for your water pitcher...


Product Specifications

  • Tested by NSF International to a capacity of 65 gallons for the reduction of chlorine in accordance with NSF/ANSI 42 and for PFOA/PFOS reduction in accordance with NSF/ANSI 53.
  • Also effective for the removal of PFHxA, PFHxS, PFNA, PFDA, PFHpA, PFPeA, PFBS, PFBA, HFPO-DA (GenX).
  • Includes Pre-Paid Mailer for Cyclopure Used Filter Return Program.
  • Compatible with Brita pitchers



Purefast® FAQ

It is important to follow the 4-step filter preparation instructions included in the Purefast User Guide. This easy 5-minute conditioning process will ensure smooth filtration and fresh tasting PFAS-free water:

Step 1. Run small streams of tap water through the top of the filter for 15 seconds. Turn the filter upside down and allow water to flow through each bottom screen for 15 seconds – a total of 60 seconds.

Step 2. Fill your pitcher with water and hold the filter under water. Gently shake and tap the filter against the interior wall of the pitcher to fully wet the media for about 2 to 3 minutes, or until you no longer see air bubbles coming out of the filter.

Step 3. Insert the filter into the pitcher reservoir by lining up the groove in the filter with the notch in the reservoir (if applicable). Gently press the filter down to secure the filter in the reservoir.

Step 4. Before use, fill the reservoir with tap water and discard the filtered water. For best results, avoid pouring tap water directly on top of the filter. Repeat this step two to three times.

For the best hydraulic performance, it is recommended to recondition the filter every 30 days. Larger households and those using the Ultramax pitcher model may need to recondition the filter every 2 weeks. To recondition, remove the filter and shake gently before following conditioning steps 1-3 (above).

Purefast filters are certified for 65 gallons of water, which can last up to 3 months for a family of 2. This is based on the CDC estimation that one person drinks 44 oz. of tap water per day, or 1,320 oz. (10 gallons) per month.

For an average water drinker:

One personFamily of TwoFamily of Four
Up to 6 monthsUp to 3 monthsUp to 1.5 months

You may notice a slower filtration rate than that of a standard Brita filter due to the addition of DEXSORB for PFAS removal in Purefast filters – this is normal.

Please note, if you use larger pitcher sizes like the 10-cup or 27-cup, it is best to fill the reservoir once per use. If you “stack” reservoir pours (one batch on top of the other), this will slow the draining of the reservoir into the pitcher.  This results from capillary action. To see more information on this term, please visit: US Geological Survey: Capillary Action and Water

High levels of air saturation in your tap water may lead to slower filtration. If your tap water looks like the image below, let your water sit in a container on the counter for 60 seconds before running it through your filter.

If you are still concerned by the rate of filtration (i.e. the filter is slowly dripping), recondition by following conditioning steps 1-3 in Q1.  

Purefast is designed to work with Brita pitchers that use standard filters, such as the following:

  • Soho (5 cup)
  • Space Saver(6 cup)
  • Tahoe (10 cup)
  • Ultramax (27 cup)

PFAS and Chlorine. In addition to PFAS removal, Purefast is also certified by NSF for chlorine (taste and odor) removal.

Mineral Ions. Purefast does not remove (leaves intact) inorganic ions like fluoride and healthy mineral ions.

Heavy Metals. Our filters use the same media as Brita filters (activated carbon and ion exchange) PLUS DEXSORB for PFAS. To expedite making our filter available to families experiencing PFAS contamination, we sought NSF certification for PFAS and chlorine. Internal testing shows that our Purefast filter removes harmful heavy metal ions like lead, cadmium, copper, etc., but we will not make those claims until we obtain NSF certification.

Please click this link.

The Purefast filter is certified for removal of PFOA and PFOS under NSF/ANSI 53. See the graph below. The blue line indicates the “influent” concentration (the water that flowed INTO the system) and the green line indicates the “effluent” concentration (the water that flowed OUT of the system, after being filtered with Purefast). The influent water had a concentration of 1500 ppt of PFAS and the effluent concentration shows non-detect levels. Our instruments are calibrated to a limit of quantification of 2 ppt for GenX and 1 ppt for all other PFAS. Non-detect levels indicate that the concentration of PFAS is below these limits of quantification.

Sustainability is one of our top priorities. Purefast will do the work to achieve ZERO PFAS in your drinking water. If you return your used filter to us, we will ensure that ZERO PFAS waste goes to the environment.

Each Purefast filter comes with a pre-paid mailer to return used cartridges to our lab for safe disposal. When you open the package, check the mailer and store it where you will remember, such as a catchall drawer in the kitchen.

When the filter is fully used, place the spent cartridge in the mailer, seal it, and drop off the package at the post office to return. Postage is already paid!

To provide our valued customers with performance-guaranteed products, each Purefast filter comes pre-conditioned for smooth filtration. Due to shipment handling and depending on your local weather, you may find some moisture or a small amount of water when you open the packaging. This is normal.

For short term storage (1-2 days), we recommend leaving the filter in the pitcher (with filtered water) and storing the pitcher in the refrigerator.

For long term storage (3+ days), we recommend leaving the filter in the pitcher (no water in the pitcher) and storing the pitcher in the refrigerator. Please don’t shake water out of the filter.

Before the next use, you may need to recondition the Purefast filter by following the steps in Q1.

Click here to see Purefast FAQ as pdf. 


We'd love to hear from you!

Have questions or comments about your Water Test Kit? Have questions or comments about our Science? Fill out the following and let us know what’s on your mind.

  • This field is for validation purposes and should be left unchanged.