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Dangers of using orthophosphate for the interior coating of lead water services?

Dangers of using orthophosphate for the interior coating of lead water services? I have a customer that her city is adding orthophosphate and she is chemical sensitive.
Q1. What type of filter media would remove orthophosphate?
Q2. I have heard that orthophosphate can cause some individuals stomach pains. Why is this possible? What is in orthophosphate that can cause this problem?
Q3. How exactly should I handle this problem?

Winston Kao
Agriculture, Water & Nutrition - Clearwater, FL, USA
2004

I don't understand your relationship to your 'customer' in such a way that I would have any clue how you should handle this problem'. Are you her landlord, plumber, vitamin store, or what? Thanks for clarification.

Ted Mooney, P.E.
Striving to live Aloha
(Ted can offer longterm or instant help)
finishing.com - Pine Beach, New Jersey
2004

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