Why Costic Soda and sodium hexa meta phosphate use at water purified system?
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Why Costic Soda and sodium hexa meta phosphate use at water purified system?
I don't know, why are they? ;)
Anyway, perhaps asking this question on a water purification forum might make more sense.
Using Google on SHMP came up with many answers, such as...
http://www.freedrinkingwater.com/water_quality/water-science/j29-08-how-is-shmp-used-as-a-dispersing-agent-and-deflocculating-agent.htm
http://www.freedrinkingwater.com/wat...ms-methods.htm
From Brian's link 452 is related to give us kidney stones and problems processing calcium. But used as a water softener.