Glossary Of Water Treatment Industry Terms . . ."U"
unaccounted-for water -
A term used in municipal water systems to describe the difference
between the water produced and that metered and sold. It usually includes
losses due to leakage, water used for fire fighting, public sprinkling
and other municipal purposes, and usually ranges from 10 to 35 percent
of the water produced.
uniformity coefficient -
A measure of the variation in particle sizes of ion exchange resins
and filter media. It is defined as the ratio of the size of particle which
has 60 percent of the material finer than itself, to the size of the particle
which has 10 percent finer than itself.
upflow - A term used to
indicate the direction (up) in which water or regenerant flows through
an ion exchanger or filter media bed during any phase of the operating
USEPA - The abbreviation
for "United States Environmental Protection Agency".
USPHS - The abbreviation for "United States Public Health Service".