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Tannin (humidica acid) is the result of decayed vegetation which is picked up by surface water and often carried to underground sources. The water generally has a yellow or brownish cast, and if put into a glass and allowed to sit does not settle out. Tannin is an organic, rather than a mineral, substance and thus cannot be removed by precipitation and filtration or by an ion exchange means. This water also has a pungent odor.

Tannin can be removed using a tanning filter. This filter contains a special ion exchange "anion" resin. This resin has an extra large available internal surface area which enable it to absorb large organic anion molecules.

There are different grades and forms of tannin resin. The resin is regenerated with a regular brine solution and citric acid.

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