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Gallionella Ferruginea |
A genus of stalked,
ribbon-like bacteria which utilize iron in their metabolism, and cause
staining, plugging and odor problems in water systems. (See iron
bacteria.) |
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Gallon |
A unit of liquid volume;
the U.S. gallon has a volume of 231 cubic inches or 3.78533 liters; the
British (Imperial) gallon has a volume of 277.418 cubic inches or 4.54596
liters. |
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Galvanic Cell |
A cell which generates an
electrical current, consisting of dissimilar metals in contact with each
other and with an electrolyte. |
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Galvanic Corrosion |
The form of corrosion which
occurs in a galvanic cell, in which one of the metals goes into solution;
accelerated by high concentrations of dissolved minerals in water, which
increases the electrical conductance; and elevated temperatures. (See
corrosion, electrolyte.) |
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Gate Valve |
A valve with the closing
element that is a disc which is moved across the stream, often in a groove
or slot, for support against pressure. |
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Gel Zeolite |
A synthetic sodium
aluminoscilicate ion exchanger. |
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Giardia Lamblia |
An intestinal parasite
commonly found in water supplies originating in mountainous or wooded
watersheds. It exists as a free-swimming protozoan-like organism in
warm-blooded animals' intestines, causing chronic diarrhea, cramps,
bloating and weight loss. Outside of the intestines, it forms a tough cyst
that protects it until it finds a new host. Resistant to chlorine and most
oxidizing agents, Giardia can be removed effectively through filtration
below 1 micrometer. |
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Giardia Lamblia |
A protozoan frequently
found in rivers and lakes, which can survive in water for 1 to 3 months,
associated with the disease giardiasis. Ingestion of this protozoan in
contaminated drinking water, exposure from person-to-person contact, and
other exposure routes may cause giardiasis. The symptoms of this
gastrointestinal disease may persist for weeks or months and include
diarrhea, fatigue, and cramps. |
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Globe Valve |
A valve in which the
closing element is a sphere, or a flat or rounded gasket, which is moved
into or onto a round port. |
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Gpg |
Abbreviation for "grain(s)
per gallon". |
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Grab Sample |
A single sample of material
collected at one place and one time. |
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Grain (Gr.) |
A unit of eight equal to
1/7000th of a pound, or 0.0648 gram. |
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Grain(S) Per Gallon (Gpg) |
A common basis for
reporting water analyses in the United States and Canada; one grain per
U.S. gallon equals 17.12 milligrams per liter (mg/l) or parts per million
(ppm). One grain per British (Imperial) gallon equals 14.3 milligrams per
liter or parts per million. |
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Gram (G) |
The basic unit of weight
(mass) of the metric system, originally intended to be the weight of 1
cubic centimeter of water at 4oC. (One pound is 454 grams.) |
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Gram-Milliequivalent |
The equivalent weight of a
substance in grams, divided by one thousand. |
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Gravimetric |
Measurement of matter on
the basis of weight. |
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Greensand |
A natural mineral,
primarily composed of complex silicates, which possess ion exchange
properties. (See manganese greensand, zeolite.) |
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Ground Water |
The water that systems pump
and treat from aquifers (natural reservoirs below the earth's surface). |
Ace Hardware
