Tannins were treated with standard strong base macroporous anion resins manufactured with styrene and divinylbenzene.
Tannin removal resin is frequently associated with a fishy odor. A residual by-product of anion resin is an amine. The amine coming from the resin is generally in very low concentrations, however the odor threshold is approximately 40 parts per billion. Although the release of this amine is not a health issue, it is aesthetically displeasing. The fishy odor is more common when the water is chlorinated and has a high pH (>8). This is often the case when chloramines are used as a disinfectant. Ammonia and chlorine are mixed causing an environment that will break down resin and the ammonia will usually cause the pH to increase. It is best to remove any type of oxidant (chlorine, chloramine or peroxide, etc.) prior to the anion unit.
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