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Registered Sanitarian > Swimming Pools & Recreational Facilities > Flashcards

Swimming Pools & Recreational Facilities Flashcards

(80 cards)

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1
Q

Studies indicate that swimmers have a higher overall illness rate over non-swimmers

A

Regardless of bathing water quality

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2
Q

The treatment system of a pool is typically recommended to be installed in which of the following flow arrangements?

A

Skimmer or gutter line, main drain line, adjustment valves, hair strainer, filter aid pump, filters, disinfectant feeder, pH feeder, adjustable inlets

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3
Q

Swimming pool water clarity is measured in terms of NTU or Nephelometer Turbidity Units. It is recommended that a level of 0.5 NTU

A

Shall not be exceeded

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4
Q

A swimming pool filtration system should filter the entire volume of water at a minimum of every

A

6 hours

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5
Q

The rate of filtration for a vacuum diatomite filter should be

A

1-2 gpm/ft2

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6
Q

Chemicals that have been used for pool disinfection include chlorine, chloroiso-cyanurates, bromine, and

A

Nothing

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7
Q

Due to the large quantity of floating organisms and materials, the gutters or skimmers should receive what minimum percent of the total pool water?

A

60%

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8
Q

The recommended and most effective method of maintaining pool water quality is

A

Continuous recirculation, chlorination, and filtration

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9
Q

One advantage of using cyanuric acid additive is that it

A

Stabilizes residual chlorine

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10
Q

The acidity-alkalinity balance affects eye irritation, water coagulation, and the

A

Effectiveness of chlorine

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11
Q

The addition of sodium bicarbonate will

A

Raise the pH

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12
Q

To raise the pH add

A

Soda ash

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13
Q

To mix acid and water, always

A

Add acid to water

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14
Q

When chlorine is added to water

A

One acid is formed

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15
Q

The best control of swimmer’s itch at a bathing beach is to

A

Add copper sulfate

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16
Q

The preferred method for controlling sewage from watercraft is the use of

A

Onboard holding tanks

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17
Q

Gas chlorine provides

A

100% available chlorine

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18
Q

The microbe primarily responsible for skin infections in whirlpools is

A

Pseudomonas aeruginosa

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19
Q

Water in childrens’ wading pools should be completely recirculated every (minimum standard)

A

60 minutes

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20
Q

The ideal pH range for swimming pools

A

7.4-7.6

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21
Q

The generally prohibited swimming facility from a public health perspective is a

A

Fill and draw pool

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22
Q

It is essential that all public pools

A

Run the recirculation and disinfection equipment 24 hours per day

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23
Q

To calculate turn over rate

A

Pool volume/flow rate/60

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24
Q

The main drain should have a grate that is how much larger than the area of the discharge pipe to prevent dangerous suction effects? (absolute minimum)

A

4 times

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25
What are the instances when a pool must immediately close?
1. Gates are not self-closing 2. The free available chlorine levels have fallen below 1 ppm (ideal 2-4 ppm, spas- 3-5 ppm). Max. level of chlorine should not exceed 4 ppm. 3. pH is not between 7.2 and 7.8 4. Water circulation/filtration system is not operating and circulating water at the proper rate 5. Main drains are not visible, properly attached, or fully intact 6. Drain covers are not VGB compliant or ANSI successor standard 7. Single drains are not VBG compliant and do not have an additional level of protection against entrapment 8. Water temperature exceeds 104 degrees F
26
What are the 3 signal words on chemicals?
Caution, warning, danger
27
What is the strongest signal word?
Danger
28
The EPA has determined that the chlorine gas used for swimming pools should be reclassified from General Use to
Restricted Use
29
Ounces to pounds conversion
Ounces / 16 = pounds
30
Yards to feet conversion
Yards x 3 = feet
31
Meters to feet conversion
Meters x 3.28 = feet
32
Grams to kilograms conversion
Grams / 1000 = kilograms
33
Fluid ounces to gallons conversion
Fluid ounces / 128 = gallons
34
Liters to gallons conversion
Liters / 3.785 = gallons
35
Fluid ounces to cups conversion
Fluid ounces / 8 = cups
36
Cubic feet to gallons conversion
Cubic feet x 7.5 = gallons
37
Quarts to gallons conversion
Quarts / 4 = Gallons
38
Pints to quarts
Pints / 2 = Quarts
39
Gallons to pounds
Gallons x 8.33 = pounds
40
Square inches to square feet
Square inches / 144 = square feet
41
BTUs vs temperature rise
BTUs= gallons x 8.33 x degrees F
42
What are the 4 main areas of interest for swimming pool inspections?
Pool structure, water treatment equipment, water quality, and sanitation
43
What does the main drain collect?
Settling solids from the bottom
44
Skimmers ? the water's surface
Clean
45
Return waterlines are positioned to ensure ?
Total water circulation
46
The pool filter is sized to handle the gallons per minute delivered by ?
The pool pump
47
User load equation (SPA)
surface area / 10 sq. ft. per user
48
User load equation (PUBLIC INDOOR)
surface area / 24 sq. ft. per user
49
User load equation (PUBLIC OUTDOOR)
deep end / 27 sq. ft. per user + shallow area / 15 sq. ft. per user
50
Surface area equations (rectangle & circle)
Rectangle- LxW= Sq. Ft. Circle- 3.14 x Radius X Radius= Sq. Ft. (radius= diameter/2)
51
Pool volume equations (rectangle & circle)
Rectangle- L x W x avg.depth x 7.5= gallons Circle- 3.14 x radius x radius x avg.depth x 7.5= gallons (average depth= (shallow + deep) /2)
52
Turnover rate equation
Pool volume / flow rate/ 60 = hours
53
Flow rate equation
Pool volume / turnover rate / 60 = GPM
54
Filter surface area
Flow rate / filtering rate = Sq. Ft.
55
Heater sizing
Pool volume x 8.33 x temp. adjustment = BTU
56
Spa water Replacement Frequency Equation
Spa gallons / 3/ avg. users per day = replacement interval (days)
57
The design flow rate for high-rate sand filters is
5-20 gpm/ft^2 | 15 gpm/ft^2 being the most used
58
The depth to which particles penetrate will be proportional to the ?
Flow rate
59
Filter media rate of cartridge filters
0.375 and 1.0 gpm/ft^2
60
Cartridge filters are considered ? media and are not ?
Replaceable, backwashed
61
In a vacuum D.E. system, the pool water flows by gravity from the main drain and then surface to an ?
Atmospheric filter tank
62
What does the filter media rate have to be between in vacuum D.E. filters?
1-2 gpm/ft^2
63
Ideal amount of free chlorine
2.0-4.0 ppm
64
Amount of combined chlorine aloud in pools
0 ppm
65
Ideal visible algae and bacteria aloud in pool water
None
66
Ideal temperature of pool
80.5 degrees F
67
Ideal cyanuric acid (ONLY IN OUTDOOR POOLS)
30-50 ppm
68
What is free chlorine
All chlorine present in the water, left over and is available to inactivate disease-causing organisms; measure of potability
69
What is combined chlorine?
The amount of chlorine that has reacted with inorganic and organic nitrogen-containing molecules to make weak disinfectants that are unavailable for disinfection
70
What is total chlorine?
The sum of combined chlorine and free chlorine
71
How does the water flow through a pool
Pool basin-->through the main drain-->skimmer via the piping-->to the pool treatment equipment-->back to the pool
72
The largest area of contamination is the water's
Surface
73
Pool codes and regulations commonly require one skimmer for each
400-500 sq. ft. of water surface area
74
The minimum water flow through a skimmer
Defined by code and manufacturer's specifications
75
Mounted at the entrance to the skimmer body is
The floating weir (adjusts the level of the water, providing the skimming action)
76
The circulation pump draws
Water from the pool. The water flows through the pool wall opening and over the weir in the skimmer. The weir acts as a barrier for water and debris which does not allow a backwards motion into the pool
77
Inside the skimmer housing is a basket for ?
The collection of larger debris, must be cleaned on a routine basis to maintain proper water flow.
78
How does an equalizer line work for a skimmer
If there is an interruption of water to the skimmer, the float valve will close and the equalizer valve will open causing water to flow out of the pool through the equalizer line. If the water level falls below the skimmer wall outlet, the equalizer line becomes active. This ensure the pump will have adequate water flow and not lose prime.
79
Hyperthermia definition
Having body temperature greatly above normal
80
Hyptothermia
Having a lower than normal body temperature

Registered Sanitarian (16 decks)

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