Salt Lake Valley Health Department
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Bureau of Water Quality and Hazardous Waste
788 East Woodoak Lane (5380 South)
Murray, Utah 84107
(385) 468-3862
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 |