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A sequesterant is an agent which prevents an ion from exhibiting its normal properties by complexing with it. Some sequestrants are threshold inhibitors because they function below stoichiometric levels.
Other sequesterants which depend on stoichiometric reactions between themselves and deposit components are called chelants.
In polymers technology a sequesterant it is creating around it a “cloud” of ions, through electrochemical attraction.
Those ions, being in the water (and analyzed by chemical analysis) are actually not available to react between them and to create chemical deposits.
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