4000 nanotechnology certified under counter filtration system

Under Counter Filtration | 4000 NANOTECHNOLOGY

Based on feedback from DOS facility management and medical personnel, the B. David Company was encouraged to develop a residential drinking water system that met strict requirements. Those requirements can be found below.

DOS Requirements:
  • Very low maintenance – only 15 minutes per year
  • No need to boil water or clean distiller boiling chambers
  • Environmentally responsible – no electricity, chemicals, or water wastage
  • Produced in the United States at an EPA inspected factory
  • Durable and long lasting
  • Third party certification to NSF testing standards of P-231, which is considered the definitive drinking water standard for virus and bacteria removal. Obtained the coveted IAPMO Platinum Seal™ for exceptional quality and function. 

After extensive research, field trials, and development, we are pleased to announce that our 4000 Nanotechnology Certified Under Counter System has met and exceeded initial DOS product guidance. In addition to the NSF P-231, we added two extra certifications – NSF/ANSI 42, reduction of free chlorine, and NSF/ANSI 53, for Cryptosporidium removal and lead reduction. We believe that this purifier is the most technologically advanced and field proven system available.


  • The average Post may save up to $350.00 per year per distiller in electrical costs versus distillation, with only a fraction of the required maintenance
  • Used at thousands of United States Post’s residences in five continents (references are available)
  • Great tasting drinking water
  • This product is on GSA contract GS-07F-9166S
Replacement Filters:

This 4000 Nanotechnology Certified Under Counter Purification System includes three proprietary filters – 4001 Nano Filter, 4002 Carbon FI Filter, 4003 DE Block Filter and easy to install hardware including a faucet.

When it is time to order replacement filters, our 4010 three pack contains one of each filter shipped in an individual box for easy replacement.


  • Reduces parasitic protozoan cysts such as Giardia and Cryptosporidium
  • Removes waterborne contaminants such as bacteria, viruses, and colloidal particles
  • Captures particles as large as tens of microns or as small as .01 microns
  • High Dirt and particulate retention – Up to 25 times more than conventional 10” filter
  • Removes most micro-pharmaceuticals and Perfluoroalkyl and Polyfluoroalkyl Substances (PFAS)
  • Reduces lead to below Federal Action Level of 10 ppb
  • Lowest Pressure Drop – Comparable to a 2-3 µ/micron filter
  • Wide pH Ranges – Effective from pH 4 to pH 9

IAPMO Testing Summary:

Required Reduction ≥ 50%
Reduction Results > 99.9%

Required Reduction 3 LRV
Reduction Results > 99.97%; 3.52 LRV

Required Reduction 4 LRV
Reduction Results > 99.99%; 5.22LRV = 99.999%

Required Reduction 6 LRV
Reduction Results > 99.99%; 7.86LRV = 99.9999%

LEAD – 6.5 PH
Required Reduction ≤ 10 µ/L
Reduction Results > 98.70

LEAD – 8.5 PH
Required Reduction ≤ 10 µ/L
Reduction Results > 98.40