POOL OPS Q&A
How do you calculate the surface area of a round pool? - Answer-pi r squared
What is total alkalinity? - Answer-The measure of the pH buffering capacity, or the
water's resistance to a change in pH.
What are the main types of suction inlets directing water out of the pool and into suction
piping? - Answer-Skimmers and main drains
How do you calculate flow rate? - Answer-(pool capacity in gallons per minute)/(turnover
rate time in hoursx60)=minimum GPM
How many gallons are in one cubic foot of H2O? - Answer-7.48
What is used to prevent groundwater from damaging an empty pool and relieves
pressure from excessive water beneath the pool? - Answer-hydrostatic relief valve
How small are the smallest particles a D.E. filter can filter? - Answer-up to 7 microns
_______ raises total alkalinity - Answer-sodium bicarbonate
What is Fairfax County's turnover rate? - Answer-6 hours
True or False: There are minimum flow rates requirements to ensure that the water is
moving at a sufficient rate in order to overturn the pool - Answer-True (obviously)
______ = term used to describe the amount of time it takes for all of the water in the
pool to go through the filtration system. - Answer-Turnover rate
What is the formula to calculate the number of gallons in a pool? - Answer-l x w x avg.
depth x 7.48
________ is water that circulates back into the pool? - Answer-return water
_______ is the physical act of cleaning the water? - Answer-filtration
What is the total alkalinity range? - Answer-80-120 ppm
What does a flow meter do? - Answer-It measures the flow of water through the re
circulation system in GPM
What does a sight glass do? - Answer-It tells you when backwashing is complete by
showing, clean, clear water inside the glass.
, In order to help maintain pH in the 7.2-7.6 ranges, the total alkalinity should be within
the range of.... - Answer-80-120 ppm
what prevents floating debris from entering back into the pool? - Answer-Skimmer weirs
(or just weirs)
What is the strongest point of suction in the pool? - Answer-The main drain
What is used to trap free particles in water (water additive). - Answer-A flocculent :)
What increases as dirt accumulates in the filter bed of sand filters? - Answer-Resistance
to flow
What is the flow rate? - Answer-The rate at which water moves through the filtration
system.
What type of filter filters the smallest particles out of the water? - Answer-Diatomaceous
Earth (or just D.E.)
If total alkalinity is _______, then the pool could be turbid or cloudy - Answer-low
What is the number of persons in a pool or spa at any given moment? - Answer-Bather
load
Name three types of filters - Answer-Cartridge, High rate sand (or just sand), and
Diatomaceous Earth (DE).
What does GPM stand for? - Answer-Gallons per minute
Influent gauge will (rise/fall) effluent gauge will (rise/fall), and GPM will (rise/fall) as dirt
accumulates on the filter bed of sand filters. - Answer-Rise, fall, fall
Reversing the flow of water through a filter is called_______. - Answer-Backwashing
Name the valve types. - Answer-Ball, float, butterfly, gate
How do you calculate the surface area of a square or rectangular pool? - Answer-l x w
What do the influent and effluent gauges indicate? - Answer-When it's time to backwash
If the total alkalinity is ________, then water could feel slippery or slimy. - Answer-High
_________ is the way the water goes in, ________ is the way out. - Answer-Influent,
Effluent
How do you calculate the surface area of a round pool? - Answer-pi r squared
What is total alkalinity? - Answer-The measure of the pH buffering capacity, or the
water's resistance to a change in pH.
What are the main types of suction inlets directing water out of the pool and into suction
piping? - Answer-Skimmers and main drains
How do you calculate flow rate? - Answer-(pool capacity in gallons per minute)/(turnover
rate time in hoursx60)=minimum GPM
How many gallons are in one cubic foot of H2O? - Answer-7.48
What is used to prevent groundwater from damaging an empty pool and relieves
pressure from excessive water beneath the pool? - Answer-hydrostatic relief valve
How small are the smallest particles a D.E. filter can filter? - Answer-up to 7 microns
_______ raises total alkalinity - Answer-sodium bicarbonate
What is Fairfax County's turnover rate? - Answer-6 hours
True or False: There are minimum flow rates requirements to ensure that the water is
moving at a sufficient rate in order to overturn the pool - Answer-True (obviously)
______ = term used to describe the amount of time it takes for all of the water in the
pool to go through the filtration system. - Answer-Turnover rate
What is the formula to calculate the number of gallons in a pool? - Answer-l x w x avg.
depth x 7.48
________ is water that circulates back into the pool? - Answer-return water
_______ is the physical act of cleaning the water? - Answer-filtration
What is the total alkalinity range? - Answer-80-120 ppm
What does a flow meter do? - Answer-It measures the flow of water through the re
circulation system in GPM
What does a sight glass do? - Answer-It tells you when backwashing is complete by
showing, clean, clear water inside the glass.
, In order to help maintain pH in the 7.2-7.6 ranges, the total alkalinity should be within
the range of.... - Answer-80-120 ppm
what prevents floating debris from entering back into the pool? - Answer-Skimmer weirs
(or just weirs)
What is the strongest point of suction in the pool? - Answer-The main drain
What is used to trap free particles in water (water additive). - Answer-A flocculent :)
What increases as dirt accumulates in the filter bed of sand filters? - Answer-Resistance
to flow
What is the flow rate? - Answer-The rate at which water moves through the filtration
system.
What type of filter filters the smallest particles out of the water? - Answer-Diatomaceous
Earth (or just D.E.)
If total alkalinity is _______, then the pool could be turbid or cloudy - Answer-low
What is the number of persons in a pool or spa at any given moment? - Answer-Bather
load
Name three types of filters - Answer-Cartridge, High rate sand (or just sand), and
Diatomaceous Earth (DE).
What does GPM stand for? - Answer-Gallons per minute
Influent gauge will (rise/fall) effluent gauge will (rise/fall), and GPM will (rise/fall) as dirt
accumulates on the filter bed of sand filters. - Answer-Rise, fall, fall
Reversing the flow of water through a filter is called_______. - Answer-Backwashing
Name the valve types. - Answer-Ball, float, butterfly, gate
How do you calculate the surface area of a square or rectangular pool? - Answer-l x w
What do the influent and effluent gauges indicate? - Answer-When it's time to backwash
If the total alkalinity is ________, then water could feel slippery or slimy. - Answer-High
_________ is the way the water goes in, ________ is the way out. - Answer-Influent,
Effluent
