Twst Flashcards
(23 cards)
1 gallon of water weights?
8.3 lbs
1 gallon of liquid chlorine weights?
10 lbs
1 cubic foot of water is how many gallons
7.5 gallons
1 horsepower = how many watts
746
2 ounces of muriatic acid lowers TA in 1000 gallons how much
10ppm
How much does .083lbs of CYA raise per 1000 gallons
10ppm
How much sodium bicarbonate per 1000 gallons for 10ppm
.15lbs
16 ounces = ____ pint
1 pint
Ounces to pounds
16 ounces = 1 lbs
Area formula
A=pi r^2
Volume of a rectangle pool
Length x width x avg depth x 7.5
Volume of circular pool
Radius x radius x 3.14 x avg depth x 7.5
Required flow rate
Pool volume / (turnover time x 60)
Required filter area
Flow rate/ gpm per sq ft
Turnover time
Gallons /
(flow rate x 60)
Water loss =
Length x width x (loss in inches / 12) x # of days x 7.5
Maximum bather load (pool) =
Surface area in sq ft /
20
Maximum bather load (spa) =
Surface area in sq ft /
10
Total chlorine =
Combined chlorine + free chlorine
Chlorine residual in ppm =
(Pounds of product) x (% of strength) x (1,000,000) / volume x 8.3
Power (watts) =
Volts x amps
Required CYA =
Ppm desired x .083 x volume / 10,000
Total dynamic head =
A. Measure vacuumed pressure at pump and multiply by 1.13
B. Measure clean filter pressure x 2.31
C.add A and B to get to all friction loss in feet of head
