Our media was created for use in contaminated drinking water systems and is diversely applicable for single households or farms, small housing communities/developments, or larger municipalities. Our media, CalxOl-Fe, is a limestone based media that is simple to use and NSF certified as safe for treating drinking water. Fill out our questionnaire to see if your system qualifies for CalxOl-Fe treatment.


CalxOl-Fe is also a strong solution for state and government agencies looking to remediate Arsenic and other heavy metals from abandoned mines. The media operates under a wide pH range and can remove both As III and V. Disposal is simple and clean as the media does not require hazardous waste disposal or can even be incorporated into concrete. After remediation, mine sites can legally close and assure a clean healthy environment.



For more technical information on the media, please email us.



In the 70’s mine closure requirements and best practices were developed to try to ensure that abandoned mines are adequately decommissioned. Environmental and safety concerns of abandoned mines and their cost to the taxpayer and the environment have led governments to tighten regulatory controls on mine closures. Mine closure plans are required by most regulatory agencies worldwide before a mining permit is granted, and must demonstrate that the site will not pose a threat to the health of the environment or society in the future. Depending on the site, the mine may be repurposed for other human uses or restored to its pre-mining use following closure. Financial assurance is increasingly required by regulators as a guarantee that the funds required for mine closure will be available in the event that the responsible company is unable to complete the closure as planned. The current worldwide market for mine remediation services is estimated at $17 billion. One of the services is often tailing pond cleanup and effluent monitoring and treatment. There are an estimated 3,500 tailings ponds worldwide. And due to failure to pass legislation and lax government regulation in the US, an estimated 39 percent of tailings-pond dam failures happen in the U.S.—a rate higher than anywhere else in the world. What happens to a mine site after a mine is closed? Read more here.

CalxAqua, LLC, located in Rapid City, South Dakota, has developed, in conjunction with the South Dakota School of Mines and Technology and Rohm and Haas (now Dow Chemical Company), a proprietary, limestone based technology to remove arsenic and heavy metals from water. The technology is applicable to a wide variety of uses, including drinking water treatment, phosphate removal from surface runoff and mine tailing pond remediation.




CalxAqua, LLC is the product of academic collaboration, entrepreneurship and private company support. The proprietary technology is a result of years of investigation by all these entities and, as such, embodies the most practical and economical approach to solving contaminated water problems.


We are a company dedicated to bringing healthy water to society.


To do this, we have assembled a strong team of leaders and supporters.


Mat Peabody is Chairman of the Board, has 45+ years of industrial experience, and has led both start-up and multi-billion dollar companies. He has lived and worked globally (Europe, Asia, Mexico, South America) and has established operations in 70 countries. He is fluent (native speaker) in English, Spanish, German; functional in Portuguese, French, Italian. Chemical Engineering B.S. from South Dakota School of Mines and Technology, MBA, with a proven record of accomplishment. Mat had leading positions with Celanese, GAF, Chemie Linz, Perrigo, X-rite and has founded/and or grown the following startups: Celgene, BioAmber, DNP Green, Diversified Natural Products, Arboris, Intumex, Biotechnologie Forschung, Applied CarboChemicals, Evergreen. He established the first western kabushiki kasha in Japan as Nippon Perrigo, put together joint ventures with Mitsui, Daicel, Chan Chung, Far Eastern Textiles, Hoechst, Benavides, Daiei, Biogal, Meyhall, Plast Labor and others.  He is currently an Entrepreneur in Residence at South Dakota School of Mines and Technology and the Managing Partner for CalxAqua.  In the past 15 years of his career, he has been a serial entrepreneur and turnaround specialist.


David Dixon is a Board Member in Calxaqua, LLC and has been involved in the initial research and development of the technology for drinking water remediation. He also is a chemical engineering faculty member in the Chemical and Biological Engineering department at the South Dakota School of Mines and Technology.


Jim Quinn is a Board Member in CalxAqua, LLC and has 35+ years of international project experience with the Army Corp of Engineers and ExxonMobil. Over his career he has lived in and managed projects and operations in Germany, Colombia, Australia, Japan, the Netherlands, and the US. This has given him a broad range of direct management opportunities and unique, multicultural work experiences. Jim has a degree in Civil Engineering from South Dakota School of Mines and has completed post graduate work towards an MBA at the University of Wyoming, University of Houston, and Rutgers. 


Arden Davis has more than 30 years of experience in ground water and water quality. During the past ten years, his research has focused on removal of arsenic from water. He is a registered professional engineer in South Dakota, has served as chairman of the Department of Geology and Geological Engineering at South Dakota School of Mines and Technology, and currently is a professor of the Geological Engineering Department. He has taught courses in ground water, engineering design, geochemistry, and digital modeling of ground-water flow and contaminant transport.


Samuel Papendick is the newest member to the CalxAqua team. He received his B.S. from Colorado State University and his Ph.D. from the South Dakota School of Mines and Technology, both in Chemical and Biological Engineering. He has been involved with all aspects of CalxAqua, LLC, from accounts acquisition to media production and R&D. In addition to his duties with CalxAqua, Dr. Papendick owns Hay Camp Brewing Company in Rapid City, South Dakota. 


Terrence Williamson has served as CEO HydroTech Engineering LLC from 2000 to November 2012, and will serve going forward as Chairman of the Board. Dr. Williamson held positions with Texaco and Equitable Life Assurance prior to coming to the South Dakota School of Mines and Technology as a Professor of Business and Economics, a position from which he retired after 30 years. Cathleen Webb has been head of the Department of Chemistry at Western Kentucky University in Bowling Green, Kentucky since 2003, and is a co-inventor of CalxAqua’s technology. Dr. Webb has published extensively and is a recognized authority in the following research areas: Environmental chemistry; aqueous geochemistry; fate and transport of heavy metals and other inorganic species in surface- and groundwater; arsenic contamination, transport, and speciation; metal sorption and mineral equilibria; water quality; remediation of water; impacts from industrial and mining activities; fluorescence and FT-IR spectroscopy;  HPLC and ion chromatography. Jenifer Sorensen is an experienced water quality analyst and project manager. She obtained her PhD in Geological Engineering from South Dakota School of Mines and Technology, where her research focused on the removal of arsenic from drinking water using limestone-based materials. Dr. Sorensen along with Dr. Webb and others participated on a team to develop a household-scale treatment system to remove arsenic in groundwater. She is a registered Professional Engineer in South Dakota.



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