## CPO Class Prep: Flash Cards

Share the CPO Class Flash Cards with a Friend!

The only point at which a suction side leak will draw in air and drip water

The Mechanical Seal (Pump Seal)

The Best Method of Algae Prevention

Brushing Pool Walls & Floor

Amount of Water that can be held in a cubic foot

7.5 gallons

The name of the chemical we use to test pH

phenol red

Total Chlorine - Free Chlorine =

Combined Chlorine

This is what is used to lubricate the pump lid O-ring

A Silicone or Teflon based lubricant

What does pH stand for?

The power of Hydrogen

The method a Saltwater pool uses to generate chlorine

Electrolysis

The protozoa associated with a human solid stool

Giardia

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

CO2 injection

The maximum amount of water that can pass through a DE filter

2 gpm per square foot of filter area

This law was established to help to prevent suction entrapment

Virginia Graeme Baker Pool and Spa Safety Act (VGB 2008)

This chemical neutralizes chlorine

Sodium Thiosulfate

The formula used to calculate the surface area of a circle

radius x radius x 3.14 = Surface Area

The recommended turnover rate for a public pool

6 hours

The maximum recommended temperature for a spa

104 degrees

When should a vacuum DE filter be backwashed

When the vacuum gauge reads greater than 8 inches of mercury

The most common form of suction entrapment

Hair entrapment

Formula to convert ounces to pounds

Ounces รท 16 = pounds

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

Close the pool

A swimming pool must maintain this amount of clearance

Four feet 100% of the way around the pool at all times

The part of the pump that throws the water

The impeller

Sand returning to the pool is most likely do to what?

A broken latteral

The only method of raising pH without affecting the Total Alkalinity

Aeration

What is the correct amount of Diatomaceous Earth to add to a DE Filter?

1 1/4 pounds per 10 square foot of filter area

The method used to clean a sand filter

Backwashing

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

Hydrostatic relief valve

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

Water Hammer

What is Cyanuric Acid used for?

To prevent UV degradation of chlorine by the sun

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

Drowning

The minimum height of a pool barrier

48 inches

This recreational water illness is contracted by breathing contaminated mist

Legionella pneumophila

What is Cavitation?

The formation and collapse of vapor in a liquid due to excessive vacuum

Best lighting to use for a water test

The light of the Northern horizon

The sector of the health department that regulates public pools

Environmental Health

The type of feeder used for chlorine tablets

An Erosion feeder

The chemical used to increase Total Alkalinity

Sodium bicarbonate

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

Water

The placement of a device that prevents machinery from being operated until that device is removed

Lockout-Tagout (LOTO)

Convert 640 ounces to gallons

640 ounces รท 128 = 5 gallons

Convert 800 ounces to pounds

800 ounces รท 16 = 50 pounds

Convert 25 yards to feet

25 yards x 3 = 75 feet

Convert 50 meters to feet

50 meters x 3.28 = 164 feet

Calculate the Surface area of a rectangle that is 20 feet wide and 40 feet long

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

(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

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

12 ft รท 2 = 6 ft radius

Calculate the surface area of a circle with a 12 foot diameter

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

6 x 6 x 3.14 x 3 x 7.5 = 2,543.4 gallons

Formula to convert inches to feet

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

20 ft x 40 ft x (1 รท 12) x 7.5 = 499.8 gallons lost

Formula for calculating Turnover rate

Pool Gallons รท Flow Rate รท 60 = Turnover rate in hours

The height of the latch for the pool gate

Minimum of 54 inches

Calculate the flow rate necessary for a 30,000 gallon pool to have a 6 hour turnover rate

30,000 รท 6 รท 60 = 83.33 gpm flow rate

The humidity in which the Natatorium must be maintained

Between 40% - 60%

Filter Sizing Formula

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

Protozoa associated with a human diarrheal incident

Cryptosporidium

Formula to Calculate required BTUs when sizing a heater

Pool Gallons x 8.33 x Degrees of desired Temperature change = Total BTUs required

The four types of energy loss

1. Evaporation 2. Convection 3. Radiation 4. Conduction

Neutral on the pH scale

7.0

The chlorine level necessary to treat a fecal incident involving a solid stool

2 ppm (If it's Poo, it's 2)

Chlorine level necessary to treat a fecal incident involving diarrhea

20 ppm (If it's Runny, it's 20)

Formula to calculate Total Dynamic Head

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

The CPO Certification Test is

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