2019-2020 Purchasing Guide Volume 1

Calculation Formulas

AMOUNT CONVERSIONS Ounces to Pounds Ounces ÷ 16 = Pounds Fluid Ounces to Gallons Fluid Ounces ÷ 128 = Gallons

DISTANCE CONVERSIONS Yards to Feet Yards x 3 = Feet Meters to Feet Meters x 3.28 = Feet

SURFACE AREAS Circle: 3.14 x radius x radius = Square Feet (Ft 2 ) (radius = diameter ÷ 2) Rectangle/Square: Length x Width = Square Feet (Ft 2 ) Triangle: (Length x Width) ÷ 2 = Square Feet (Ft 2 ) POOL VOLUME Surface Area x Average Depth x 7.48 (7.50 = GALLONS Average Depth = (shallow depth + deep depth) ÷ 2

TURNOVER RATE Pool Volume ÷ Flow Rate ÷ 60 = Hours

QUICK REFERENCE CHARTS

FLOW RATE (MINIMUM) Pool Volume ÷ Turnover Rate (hours) ÷ 60 = Gallons per Minute (GPM)

FILTER SURFACE AREA Flow Rate ÷ Filter Media Rate = Square Feet (Ft 2 ) of Filter Surface Area Needed

FILTER MEDIA RATE Also known as FILTERING RATE, MEDIA ABILITY OF FILTERING ABILITY (Measured in gallons per minute per ft 2 )

TYPE OF FILTER

GPM PER FT 2 OF FILTER AREA

ACCEPTED RATE

D.E. (W/O Slurry Feed)

1.5 – 2.5

*2.0

D.E. (W/Slurry Feed)

2.0 – 3.0

*2.5

SAND (High Rate)

5.0 – 20.0

*5.0 - 20.0

SAND (Rapid Rate)

1.5 – 5.0

*3.0

CARTRIDGE *0.375 *VARIES PER STATE AND LOCAL CODES (Based upon type and style of filter –pressure or vacuum) 0.375 – 1.0

Filter Media Rate = Gallons per Minute per Square Foot (Ft 2 )

MAXIMUM USER (BATHER) CAPACITY Surface Area ÷ Health Code Bather Capacity = MAXIMUM USER CAPACITY

112

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