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FYI: Zinc Orthophosphate Works By Coating Water Pipes with Lead Phosphate and Copper Phosphate

November 27, 2007

Crotonblog: Letters to the Editor, Croton-on-Hudson, New York 10520
To the editor,

Supplementary Correction from Dan and Bev Ferguson, 11/28/07: Although copper compounds are poisons, the toxicity of copper phosphate to humans and its potential as a carcinogen have not been determined. Therefore the headline has been corrected to reflect this fact.

Copper Phosphate: Toxicity to humans, including carcinogenicity, reproductive and developmental toxicity, neuro-toxicity, and acute toxicity are unknown.

Both Lead and Copper Phosphates Create Particulates That Go Into The Water and Can Be Measured At The Tap!

Research into adding Zinc Orthophosphate to our drinking water has brought up some well documented, disturbing, findings. This research was shared with Croton village board members before the final vote on Zinc Orthophosphate, via email, but it has recently come to our attention that many board members do not read the email sent to their Croton board email addresses—so we have recently sent printed copies to the Mayor and each member of the board.

“The primary mechanism by which corrosion protection is achieved by the addition of Zinc Orthophosphates is through the formation of lead phosphate and copper phosphate films” — Lead and Copper Corrosion Control report from the Government Engineering Office 2007.

Lead Phosphate is Reasonably Anticipated to be a Human Carcinogen” according to the U.S. Department of Health and Human Services.

Copper Phosphate: Toxicity to humans, including carcinogenicity, reproductive and developmental toxicity, neuro-toxicity, and acute toxicity are unknown.

Lead is most dangerous in it’s particulate form as found in paint. When Zinc Orthophosphate is added to the water there is an increased release of particulate lead or copper species which may be associated with a zinc phosphate precipitate. Finally, the occurrence of particulate and colloidal species, especially lead, was confirmed by utility tap water sampling.” reference below — 2004 American Society of Civil Engineers doi:10.1061/(ASCE)0733-9372(2004)130:2(136)

In addition there is considerable evidence that Zinc Orthophosphate, acts as a fertilizer for bacteria such as Coli form and other organisms such as Pseudomonas, to increase in the water where Zinc Orthophosphate has been added.

Research has also shown that when Zinc Orthophosphate is added to the water the rust in the pipes often gets much worse before it gets better—if it gets better it does not always work. A simple water filter will remove over 99% of the lead from our drinking water, Zinc Orthophosphate reduces lead to an unknown amount. Often in places where Zinc Orthophosphate has been added to the water people still need to use a water filter, in addition to the Zinc Orthophosphate, to remove all of the lead.

While a simple water filter removes lead, it does not remove Zinc Orthophosphate, a reverse osmosis filter or distillation is the only way to remove Zinc Orthophosphate, it is expensive and wasteful of water.

The next time you turn on the tap and water gushes out into a glass, reflect on the following disclaimer from the EPA’s 1997 Fluoride: Regulatory Fact Sheet: “In the United States, there are no Federal safety standards which are applicable to additives, including those for use in fluoridating drinking water.”

To Your Health!

— Dan and Bev Ferguson, Croton-on-Hudson


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