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Filter taste

Name for a relatively easily developing unpleasant wine defect, which is also known as paper, cardboard or carton taste or clay. Often this is also referred to with the adjective "wet" or "moist". It is mostly caused by improper storage of filter aids used for filtration. Due to their strongly adsorptive effect, filter sheets very quickly absorb odorous substances from the environment. Activated carbon, bentonite, diatomaceous earth and cellulose are particularly susceptible to this. Moist packaging material also increases the risk of a mould taste. The unpleasant chemical smell is similar to a "wet paper or cardboard" smell. The taste is hard and scratchy with a bitter note of paper or cellulose. The fault can be prevented by soaking the filters before use.

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