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Hedgehog™ Water Contaminant Removal System

Sandia National Laboratories

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PDF Document PublicationMarket Sheet (776 KB)

Technology Marketing Summary

The in-tank recirculating treatment system reduces the levels of contaminants in water storage tanks. A recirculation pump continually sends water though a treatment in order to reduce the levels of contamination.


In arsenic decontamination testing, small water systems (~100 connections or less) with ambient arsenic (As) levels of 11-25 ppb could achieve low cost compliance with the new US arsenic limit of 10 ppb by using this in-tank filtration system. Estimates indicate results would be similar in other types of contaminants. The smaller scale, greater efficiency, and reduced cost of this filtration system make it a viable option of small tank owners and communities. The annual cost for the Hedgehog™ is approximately 1/3 of the GIM option which supports the notion that the smaller the system, the more appropriate the in-tank treatment system becomes.

  • Highly effective in treating arsenic-contaminated systems and can be expanded to filter other contaminants
  • Less costly than traditional removal systems
  • Commercially available components with unique design
  • More efficient for smaller tank sizes
  • Lower maintenance costs
Applications and Industries
  • Water treatment
  • Ideal for use in smaller community water tanks or personal water tanks
More Information

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Patents and Patent Applications
ID Number
Title and Abstract
Primary Lab
Patent 7,514,004
In-tank recirculating arsenic treatment system
A low-cost, water treatment system and method for reducing arsenic contamination in small community water storage tanks. Arsenic is removed by using a submersible pump, sitting at the bottom of the tank, which continuously recirculates (at a low flow rate) arsenic-contaminated water through an attached and enclosed filter bed containing arsenic-sorbing media. The pump and treatment column can be either placed inside the tank (In-Tank) by manually-lowering through an access hole, or attached to the outside of the tank (Out-of-Tank), for easy replacement of the sorption media.
Sandia National Laboratories 04/07/2009
Technology Status
Technology IDDevelopment StageAvailabilityPublishedLast Updated
US Patent# 7,514,004Prototype - Sandia estimates this technology’s TRL at approximately a level 6/7. Prototypes have been tested and shown to work in an operational laboratory environment which includes the integration and demonstration of the components.Available - Various license and partnering options are available. Please contact the Intellectual Property department to discuss.04/08/201004/05/2013

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