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Fecal |
Matter containing or
derived from animal or human wastes or feces. |
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Filter |
A device or system for the
removal of solid particles (suspended solids). |
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Filter Area |
The effective area through
which water passes through filter media, often expressed in square feet.
(See cross sectional area.) |
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Filter Medium |
(See medium.) |
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Filtrate |
The effluent liquid from a
filter. |
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Fines |
Extremely small particles
of filter media or ion exchange material, often the result of breakage or
chemical or physical deterioration. |
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Finished Water |
Water that has been treated
and is ready to be delivered to customers. |
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Fixed Solids |
The suspended or dissolved
solids remaining after ignition, usually at 600oCl; usually due to
inorganic matter which is not volatilized at the ignition temperature. |
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Fixture |
In plumbing, a permanently
installed device in which water is used, such as a faucet or toilet. |
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Fixture Unit |
An arbitrary unit assigned
to different types of plumbing fixtures, and used to estimate flow rate
requirements and drain capacity requirements. |
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Floc |
An agglomeration of finely
divided suspended particles in a larger, usually gelatinous particle the
result of physical attraction or adhesion to a coagulant compound. |
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Flocculation |
The process of causing a
"floc" to form after treatment with a coagulant by gentle
stirring or mixing. (See coagulation.) |
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Flow Control |
A device designed to limit
or restrict the flow of water or regenerant; may include a throttling
valve, an orifice of fixed diameter, or a pressure compensating orifice. |
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Flow Rate |
The quantity of water or
regenerant which passes a given point in a specified unit of time, often
expressed in gallons per minute. |
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Fluoridation |
The addition of a fluoride
compound to a water supply for the reduction in incidence of dental
caries. |
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Flush Tank |
A tank or chamber in which
water is stored for rapid release. |
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Flush Valve |
A self-closing valve
designed to release a large volume of water when tripped. |
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Fma |
Abbreviation for free
mineral acidity (see mineral acidity). |
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Fouling |
The process in which
undesirable foreign matter accumulates in a bed of water conditioning
media, clogging pores and coating surfaces and thus inhibiting or
retarding the proper operation of the bed. |
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Free Available Chlorine |
The concentration of
residual chlorine present as dissolved gas, hypochlorous acid or
hypochlorite, not combined with ammonia or in other less readily available
form. |
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Free Carbon Dioxide |
Carbon dioxide present in
water as the gas, or as carbonic acid, but not that combined in carbonates
or bicarbonates. |
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Free Chlorine |
See free available
chlorine. |
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Free Mineral Acidity |
See mineral acidity. |
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Freeboard |
The vertical distance
between a bed of filter media or ion exchange material and the overflow or
collector for backwash water; the height above the bed of granular media
available for bed expansion during backwashing; may be expressed either as
a linear distance or a percentage of bed depth. |
