Ullage The air space between the level of the wine in a container and the cork. In the bottle, it should be between + in and + in, while in casks or jugs it should be kept to the minimum consistent with an allowance for expansion.

Ultra Filter A filter capable of removing very small particles from suspension

Unsuitable Containers may be taken to include ones made from toxic materials or food grade plastics.

Urea An ammonium salt which is suitable for use as a nutrient in place of ammonium phosphate. It is the normal chemical form in which most vertebrates excrete nitrogen waste from their bodies. (Of course, this is not the source of the urea used for this purpose.)

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