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VOLUME CALCULATIONS
Length x width x average depth x 7.5 = Volume (in gallons)
of square or rectangular pools.
3.14 (pi) x radius squared x average depth x 7.5 = Volume
(in gallons) of round pools.
0.45 x (A + B) x length x average depth x 7.5 = Volume (in
gallons) of kidney or irregular-shaped pool
MEASUREMENTS
7.5 gallons in each cubic foot of water
1 inch = 0.0833 feet
radius = diameter ÷ 2
1 gallon of water weighs 10 pounds
1 gallon of chlorine weighs 8.3 pounds
16 ounces dry weight = 1 pound dry weight
128 ounces liquid = 1 gallon
8 ounces liquid = 1 cup liquid
1,000 watts = 1 kilowatt
1 milliamp = 0.001 amp (30 milliamps will cause muscle contractions)
1 psi = 2.31 feet of head (resistance)
1 psi = 28 inches water column pressure (WCP)
1 inch of mercury = 1.13 feet of head
1 micron = one-millionth of 1 metre = 0.0000394 inches (the
human eye can detect objects as small as 35 microns)
1 grain of table salt = 100 microns
3/4 of 1 volt = 750 millivolts = .75 volts
1 Btu (British Thermal Unit) is the amount of heat required
to raise 1 pound of water 1° F
1 therm (measurement of gas supply) = 100,000 Btu per hour
1 gallon of fuel oil = 140,000 Btu
1 kilowatt = 3,412 Btu
1 ton (heat pump rating) = 15,000 Btu
A typical bather displaces 2 cubic feet of water
1 HP = 746 watts
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