Salt Lake Valley Health Department

Swimming Pools

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Salt Lake Valley Health Department
Environmental Health Division
Bureau of Water Quality and Hazardous Waste
788 East Woodoak Lane (5400 S) Suite 120
Murray, UT 84104
(801) 313-6700

Water Quality/Hazardous Waste Home

Pool Calculations

Quantity Conversions
Ounces to Pounds - OZ./16=LBS

Ounces to Gallons - OZ./128=GALS

Cubic Feet to Gallons - FT³*7.48=GALS

1 Tablespoon = 3 Teaspoons

1 Cup = 16 Tablespoons

1 Pint = 2 Cups

1 Quart = 2 Cups

1 Gallon = 4 Quarts

1 Cup of water weighs 8 Ounces

Distance Conversions
Yards to Feet - YDS./3=FT

Meters to Feet - M*3.28=FT

Surface Area
Rectangle or Square - L*W*H=ft&sub3;

Circle - Π*r² =ft²

Volume
Rectangle or Square - L*W*H=ft³ (A)

Circle - Π*r³ =ft³

Turnover Rate
Pool Volume/Flow Rate/60=Hours

Flow Rate
Pool Volume/Turnover Rate (Hours)/60=Gallons per Minute

Filter Surface Area
Flow Rate/Filtering Rate=ft² of filter material

Average Depth
(Shallow Depth+Deep Depth)/2=Average Depth

Heater Sizing
(Beginning Pool Temp-Desired Pool Temp)*8.33

1 BTU will raise 1 Cu. Ft. water 1 degree F

Vol. Pool X 8.53 X Temp. Change=BTU Needed

BTU Needed/Output Heater=Time Needed

Bather Load
Surface Area/Capacity

Spas	1 Bather per 10 ft.
Pools	10 sq. ft/per Bather Non Swim (3'-5')
	24 sq. ft/Bather Swimmer ('5+)
	300 sq. ft. Diving Area (9 Swimmers)

Filter Capacity
Filter Area*Filter Media Rate*Required Turnover Time=Filter Capacity

Water Weight
1 Gallon of Water Weighs 8.33 lbs.

1 Cu. Ft. of Water Weighs 62.4 lbs.

Filter Pressure

Influent	Effluent
18	13	New
25	10	Dirty