CPO Class Prep: Flash Cards

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The only point at which a suction side leak will draw in air and drip water
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The Mechanical Seal (Pump Seal)

The Best Method of Algae Prevention
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Brushing Pool Walls & Floor

Amount of Water that can be held in a cubic foot
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7.5 gallons

The name of the chemical we use to test pH
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phenol red

Total Chlorine - Free Chlorine =
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Combined Chlorine

This is what is used to lubricate the pump lid O-ring
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A Silicone or Teflon based lubricant

What does pH stand for?
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The power of Hydrogen

The method a Saltwater pool uses to generate chlorine
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Electrolysis

The protozoa associated with a human solid stool
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Giardia

The only method of lowering pH that will increase the Total Alkalinity
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CO2 injection

The maximum amount of water that can pass through a DE filter
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2 gpm per square foot of filter area

This law was established to help to prevent suction entrapment
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Virginia Graeme Baker Pool and Spa Safety Act (VGB 2008)

This chemical neutralizes chlorine
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Sodium Thiosulfate

The formula used to calculate the surface area of a circle
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radius x radius x 3.14 = Surface Area

The recommended turnover rate for a public pool
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6 hours

The maximum recommended temperature for a spa
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104 degrees

When should a vacuum DE filter be backwashed
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When the vacuum gauge reads greater than 8 inches of mercury

The most common form of suction entrapment
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Hair entrapment

Formula to convert ounces to pounds
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Ounces รท 16 = pounds

The first thing you should do when someone poops in the pool
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Close the pool

A swimming pool must maintain this amount of clearance
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Four feet 100% of the way around the pool at all times

The part of the pump that throws the water
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The impeller

Sand returning to the pool is most likely do to what?
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A broken latteral

The only method of raising pH without affecting the Total Alkalinity
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Aeration

What is the correct amount of Diatomaceous Earth to add to a DE Filter?
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1 1/4 pounds per 10 square foot of filter area

The method used to clean a sand filter
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Backwashing

This device is designed to allow ground water to enter the pool as a "Pop-up" preventative
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Hydrostatic relief valve

This can be caused by moving a valve handle while the pump is running
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Water Hammer

What is Cyanuric Acid used for?
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To prevent UV degradation of chlorine by the sun

The number one cause of accidental death of children ages 1-4 years
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Drowning

The minimum height of a pool barrier
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48 inches

This recreational water illness is contracted by breathing contaminated mist
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Legionella pneumophila

What is Cavitation?
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The formation and collapse of vapor in a liquid due to excessive vacuum

Best lighting to use for a water test
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The light of the Northern horizon

The sector of the health department that regulates public pools
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Environmental Health

The type of feeder used for chlorine tablets
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An Erosion feeder

The chemical used to increase Total Alkalinity
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Sodium bicarbonate

The type of fire extinguisher that should be in a chemical storage area
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Water

The placement of a device that prevents machinery from being operated until that device is removed
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Lockout-Tagout (LOTO)

Convert 640 ounces to gallons
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640 ounces รท 128 = 5 gallons

Convert 800 ounces to pounds
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800 ounces รท 16 = 50 pounds

Convert 25 yards to feet
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25 yards x 3 = 75 feet

Convert 50 meters to feet
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50 meters x 3.28 = 164 feet

Calculate the Surface area of a rectangle that is 20 feet wide and 40 feet long
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20 x 40 = 800 square feet

Calculate the average depth of a pool with a shallow end depth of 4 feet and a deep end depth of 8 feet
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(4 ft + 8 ft) รท 2 = 6 ft average depth

Calculate the gallonage of water in a rectangle pool that is 20 feet wide and 40 feet long with a depth that is 4 feet in the shallow end and 8 feet at the deep end
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20 x 40 x ((4+8) รท 2) x 7.5 = 36,000 gallons

Calculate the radius of a circle with a 12 foot diameter
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12 ft รท 2 = 6 ft radius

Calculate the surface area of a circle with a 12 foot diameter
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6 x 6 x 3.14 = 113.04 sq ft

Calculate the amount of water in a round pool with a 12 foot diameter and is 3 feet deep
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6 x 6 x 3.14 x 3 x 7.5 = 2,543.4 gallons

Formula to convert inches to feet
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Inches รท 12 = Feet

Calculate the amount of water lost in a 20 foot wide rectangle pool that is 40 feet long that loses 1 inch of water
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20 ft x 40 ft x (1 รท 12) x 7.5 = 499.8 gallons lost

Formula for calculating Turnover rate
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Pool Gallons รท Flow Rate รท 60 = Turnover rate in hours

The height of the latch for the pool gate
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Minimum of 54 inches

Calculate the flow rate necessary for a 30,000 gallon pool to have a 6 hour turnover rate
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30,000 รท 6 รท 60 = 83.33 gpm flow rate

The humidity in which the Natatorium must be maintained
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Between 40% - 60%

Filter Sizing Formula
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Flow rate รท Filter Media Rate = Square Feet of Filter Required

Protozoa associated with a human diarrheal incident
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Cryptosporidium

Formula to Calculate required BTUs when sizing a heater
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Pool Gallons x 8.33 x Degrees of desired Temperature change = Total BTUs required

The four types of energy loss
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1. Evaporation 2. Convection 3. Radiation 4. Conduction

Neutral on the pH scale
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7.0

The chlorine level necessary to treat a fecal incident involving a solid stool
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2 ppm (If it's Poo, it's 2)

Chlorine level necessary to treat a fecal incident involving diarrhea
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20 ppm (If it's Runny, it's 20)

Formula to calculate Total Dynamic Head
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(Pressure gauge reading x 2.31) + (Vacuum gauge reading x 1.13) = Total Dynamic Head

The CPO Certification Test is
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Only 50 questions, all multiple choice, and open book You Got This!

For additional prep materials (including video instruction on all math shown above), visit us at CPO Class Prep