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Sequestration is a technique to prevent a contaminant such as iron from precipitating from the water.  This solution does not remove the contaminant but ties it up, hampering it from oxidizing and fouling the water supply.

Polyphosphates keep iron in solution by stabilizing and dispersing the iron so preventing it from oxidizing.  


When Polyphosphate treatment is initiated it exerts a dispersing action on old deposits of iron from within the system.  Frequent flushing of pressure tanks and hot water system may be required.

Heating, such as by hot water tank or cooking can cause reversion of Polyphosphate to a simpler phosphate compound, which has no sequestering ability,  thereby losing its ability to keep iron from oxidizing.

Polyphosphates are only effective in the control of dissolved iron.  They will not control precipitated iron, organic iron or iron bacteria. 

Testing should be done first.

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Last modified: January 12, 2023