Tannin & Organics Removal Media
When Tannins are present, they will cause a yellow to dark tea color in water and an unpleasant taste and odor. This effect is caused by a humic and fulvic organic acids, which are found in streams, rivers lakes and deep groundwater wells. The structure of tannins depends on the vegetation in the area and varies from location to location.Tannin molecules tend to form anions in water above pH 6 and can be treated with anion exchange resins. Below pH 5, tannins are better treated with activated carbon.