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New Release – Nano Fiber Electro-Positive Gravity Filter – Fits All Gravity Feed Systems – Fluoride Removal Option Add On Now Available


Greenfield Water Solutions is proud to offer a new, updated gravity feed filter to our product line!

Zero prep required / Sub micron-carbon impregnated / Silver infused / Fits Berkey, Propur, Aquacera and other gravity feed filter systems.

Advanced Filtration Eliminates 99.9999% of Viruses, 99.9999% of Bacteria, 99.99% of Protozoa, Parasites and Cysts. Reduces Inorganic Minerals / Compounds, Heavy Metals, Pharmaceuticals, VOCs, and Broad Spectrum Contaminants

Fast Flow Nanofiber gravity feed filters utilize cutting edge American engineered, American made technology, certified space technology co-developed by NASA:

  • Only one filter needed to address concerns – No add-ons or extra filters required – You can order two if your wish but filter will last far longer than any other gravity feed filter available. 
  • Faster drip rate than a typical ceramic filter.
  • Third party tested – Meets/Exceeds NSF/ANSI 42- and 61- standards
  • Outperforms ceramic gravity feed systems that require multiple filters (all you need are one nano-flow filter)
  • Up to 12 gallons per hour water filtration from a single filter. *Subjective to water quality and source.
  • NO priming, NO waiting 24 hours for full flow. ZERO PREP NEEDED.
  • No maintenance, slower to clog, and no fragility related issues found with ceramic filters.
  • Filters water up to 200 times faster than a mechanical (micron) filter
  • Lasts longer, holds 20-25 times more dirt and contaminants than a mechanical (micron filter) capable of removing viruses.
  • Large 2 1/2″ x 7 1/2″ Nano Filter with a 5-micron outer wrap

The Nano fiber filter has not been tested for fluoride removal.  If you’re concerned about fluoride in your water, we recommend the Aquametix or Cerametix gravity feed filters.

Filters up to 2500 with one filter or 5,000 gallons with two filters.

Plugs available for empty filter holes.

Click here to learn how to further improve the health benefits of your water: Handheld Water Vortexer

Ships worldwide



Maximize the potential of ANY gravity feed system with a powerful boost!

Looking to enhance your gravity-fed water filtration and further eliminate contaminants like Fluoride, Arsenic, and many other impurities? Try incorporating the GoPure Pod into your lower reservoir. (Lab Tests at link)

Important Note Regarding Gravity Feed Filter Use

Sediment is a common culprit when it comes to blockages in gravity feed filters. To prevent this, it’s advisable to use a sediment filter prior to running water through this particular filter when using well water.

However, for city water, the need for pre-filtration may vary depending on the area, as water quality can fluctuate. In any case, loose sediment on the outside of the filter can be easily rinsed off.

Keep in mind that sediment accumulation can lead to flow issues, which can ultimately shorten the lifespan of the filter.

While Cerametix and Aquametix filters can be scrubbed to remove sediment, nano-fiber filters can only be rinsed.

Additional Features of the Nano-Fiber Gravity Feed Filter:

• Carbon & Silver Impregnated
• Reduces 99.9999% of waterborne viruses 
• Reduces 99.9998% of waterborne bacteria 
• Reduces 99.99% of waterborne protozoa 
• Filters water up to 200 times faster than a mechanical (micron) filter 
• Lasts longer, holds 20-25 times more dirt and contaminants than a mechanical (micron filter) capable of removing viruses
• Broad Spectrum contaminant reduction/removal with consistent removal rates for life of filter
• Filters enough water to sustain a family of four, for up to six months during an emergency, disaster situation
• They are not a mechanical filter media that relies on pore size to remove contaminants
• Removal of sub micron contaminants is achieved by electro-adhesion and ion exchange
• Filter is based on the mineral pseudoboehimite, AIO(OH)
• Each gram of Alumina fiber has a surface area greater that 500 sq. meters
• The active fibers are 2 nm in diameter and approximately 250 nm in length
• The crystal structure of the mineral creates a natural electrokinetic potential of Al+++ on the surface of the fiber
• It is not an electrostatic charge that can be dissipated by alcohol immersion
• Charge potential maintains integrity between pH of 5.0 – 9.5 in polar liquids
• The available hydroxyl group in each fiber will also exchange protons with many  electropositive colloids to retain them through a form of ion exchange
• The Crystal structure allows for an extremely high surface area and a large number of active sites for sub-micron contamination removal
• The pore size of the media is engineered such that the charge field covers the entire void of every pore
• There are approximately 400 layers of these pores in the thickness of the media that contamination pass through during filtration, creating a tortuous path
• The charge field removes the negatively charged sub-micron particles while the larger particles are captured with the fiber structure of the media
• The Nano-fiber filter captures “small” particles not captured by conventional, mechanical filters
• The  Nano-fiber filter captures organic/microbial macromolecules
• Removes bacteria and viruses
• Mean pore size of 1.25 microns 
• Cartridge pressure drop <0.1 bar
• Unique benefits: High flow rates, low pressure drop at Sub-micron retention
• Each layer has Nano-alumina, powdered activated carbon, Antimicrobial silver and approximately 400 layers of charge fibers



In lab tests, Cerametix showed a 97.5% fluoride reduction rate, Aquametix showed a 99.99% fluoride reduction rate. The Nano-Fiber filter has not yet been tested for fluoride removal. 


The Cerametix filters will last approximately 8 months with 2 filters (500 gallons per filter.) Aquametix filters will last approximately 1 year with 2 filters (750-1000 gallons per filter). Nano-Fiber filters will last approximately 1 year with 1 filter (2500 gallons.) Please note, replacement time will vary based on water dynamics/usage.


If filters will be unused for an extended period of time, empty the reservoir of water and remove the filters. Rinse them, let them dry, and store them in a cool, dark place. When you’re ready to use them again, simply rinse them and re-install. Re-priming is not needed. 


Red-dye tests are not recommended as they are ineffective and will damage the filters, potentially making them unusable. Strip tests can be purchased and used to gauge when replacement is needed. 


Our Cerametix and Aquametix filters are certified by NSF and have been 3rd party tested. The Nano-Fiber has been third-party tested and meets or exceeds NSF standards, however it has not been certified by NSF. Both filters are IAPMO certified and third party EPA certified lab tested.

Water Pure Nanofiber filters are 3rd party lab tested to reduce the following contaminants

>99.99% viruses (polio, rotavirus, norovirus, etc.)
>99.99% bacteria (e coli, legionella, pseudomonas, etc.)
>99.95% cysts (giardia, cryptosporidium, etc.)

The WP filters remove or rather reduces the following heavy metals:

>95% Lead
>80% Ferrous Iron
>95% Arsenic V
>95% Cadmium
>85% Chromium
>75% Selenium
>60% Mercury

Tested by a certified laboratory in the U.S. (testing was done at 6.5pH)

The WP filter removes or reduces the following organic and inorganic chemicals:

Chlorine (carbon version)
Bromine (carbon version)
Iodine (carbon version)
VOCs (volatile organic compounds)
*PCBs and BPA
Residual pharmaceuticals
Biofouling precursors: organic acids, proteins, polysaccharides

Fluoride testing coming soon from the manufacturer