Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

REHS Study > Pools > Flashcards

Pools Flashcards

1
Q

what are the 4 leading causes of accidental deaths

A
  1. car accident
  2. falls (number one injury at home)
  3. fires
  4. drowning
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what is the leading cause of work related accidental death

A

fires and explosions

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what is the ideal human body temperature

A

98.6 F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

about ____ quarts of water can be expelled from the human body a day

A

6 quarts

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

how do you convert fahrenheit to celsius

A

F -32
/9
x 5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

convert 95F to celsius

A

35

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

how do you convert Celsius to fahrenheit

A

C x 9
/5
+ 32

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

kelvin = celsius + _____

A

273

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

a 32F day with a 20 mph wind could cause windchill temperatures down to ____

A

0F

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

high altitude is any elevation above ____ft (__ miles)

A

5280 feet or one mile above sea level

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

at one mile above seal level there is ____ % less oxygen and also less _____

A

40-45% less oxygen

also less humidity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

It takes the average human body ________ days to acclimate to extreme conditions

A

10-14 days

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

What are the minimum turnover rates for

pool
spa
spray ground
wading pool
medical pool
A 
pool 6 hours
spa 30 minutes
spray ground 30 minutes
wading pool 1 hour
medical pool 2 hours
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is the minimum flow (gpm) for a 50,000 gallon pool

A

139 (50k/360 mins)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

DE filters
composition
maximum gpm/ft2

A

composition - microscopic diatoms (aquatic marine life), calcified, appears like coffee grounds

maximum filtration of 2 gpm/sq foot of filter area

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The in and out pressure of a filter should never differ by more than ________ psi

if so the filter needs to be ________

A

10

backwashed/cleaned/replaced

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Cartridge filter max gpm/sq ft

A

.375 gpm/sq ft

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

the best type of filter for a pool with more than 30,000 gallons is ____________

A

sand filter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

the most popular type of filter for a spa is __________

A

cartridge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

the best type of filter for a pool with less than 30,000 gallons is _____________

A

DE filter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

sand filters are (more/less) efficient than DE filters

A

less efficient, but offer faster filtration

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Rapid Sand Filter
max filtration rate
minimum depth of media ______
minimum depth of filter gravel___________
effective particle size between ___ and ___ mm
uniformity coefficient not exceeding _____

A

3 gpm/sq ft

min media depth - 20 inches
min filter gravel depth - 10 inches

particle size - .40 - .55 mm

max coefficient 1.75

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

High Rate Sand Filters
max filtration rate
effective particle size between ___ and ___ mm
uniformity coefficient not exceeding _____

A

15 gpm/sq ft
.40 - .55 mm
max coefficient 1.75

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

Public pool water quality
standard plate count (heterotrophic plate ocunt) shall not exceed _____ CFU per ml

total coliform
membrane filtration method - must be less than ___ CFU per 100 ml
multiple tube fermentation method - must be less than _____ CFU per 100 ml

A

standard 200 CFU per ml

total coliform
membrane filtration - 1 CFU per 100 ml
fermentation - 2.2 CFU per 100 ml

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
All pool equipment must be certified by what standard?
NSF/ANSI 50-2012
26
Chlorine in water breaks into _____ and _____ which together are called _______________
XCl + H20 ---> HOCL (Hypochlorous Acid) and OCL- (Hypochlorite ion) + H+ (Hydrogen ion) together they are Free Chlorine
27
_____________ is the active killing form of chlorine in water
HOCL, Hypochlorous Acid
28
Chloramines form when Free chlorine binds with ___________. Chloramines are not an effective __________
contaminants in the water, usually ammonia compounds. not an effective disinfectant
29
unstabilized vs stabilized chlorine disinfectants
unstable - no Carbon atom - sensitive to UV light | stable - contain carbon atom - not sensitive to UV light
30
Name 6 types of chlorine disinfectants, their physical appearance, stable/unstable, and available chlorine content
unstable sodium hypochlorite - NaOCl - liquid - 11% calcium hypochlorite - Ca[OCl]2 - granular, tabs - 70% lithium hypochlorite - LiOCl - granular - 35% (not used often) chlorine gas - CL2 - gas - 100% stable trichlor - C3N3O3CL3 - tablets mostly, granular - 90% dichlor - NaCL2C3N3O3 - granular - 60%
31
the most pH neurtral chlorine type is _____
dichlor
32
What is cyanuric acid
added to protect unstabilized chlorine form the effects of sunlight.
33
Bromine disinfectant
tablets usually, 27% available bromine content used more in spas because it naturally lowers the pH can be destroyed by sunlight but cyanuric acid does not work for bromine
34
Name some other methods that can be used to disinfect public pools
ozone (gas) chlorine generation (salt) UV light
35
free chlorine requirements for pools and spa/wading/sprayground with and without CYA
w/o cya pools min 1, max 10 spas min 3 max 10 w/ cya pools min 2 max 10 spas min 3 max 10
36
bromine residual minimum in pools vs spas
pools min 2ppm, spas/wading/spray min 4ppm
37
minimum and maximum pH maximum CYA concentration max combined chlorine concentration max spa temp
7.2-7.8 100 ppm CYA max max .4 ppm combined chlorine max spa temp 104F
38
a wading pool has a max depth of ___
18 '' at the deepest point
39
What are the two types of tests for pool/spa water
Orthotoludene (ortho test) - measure total chlorine, heat sensitive DPD - Diethyl-Phenylene-Diamine - measures free chlorine, combined chlorine, not heat sensitive
40
sample water should be taken at a depth of ______
12-18 inches
41
What are two common chemicals used to raise the pH and one common chemical to lower the pH
raise pH Sodium carbonate "soda ash" NaCO3 Sodium hydroxide "caustic soda" NaOH lower pH Hydrochloric acid "muriatic acid" HCL
42
copper in pool water can not be above _____ ppm
.2 ppm
43
TDS (water hardness) should be between ___ and ___ ppm
175-300 ppm TDS = total dissolved solids
44
Which chemical is commonly used to neutralize chlorine
Sodium thiosulfate
45
algae growth can be controlled by used what chemical
Copper sulfate (CuSO4)
46
in swimming pools ___% of water going through the skimmer and ___% goes through the main drain
75% skimmer | 25% main drain
47
What does "feet of head/head pressure" mean in regards to the pump
the flow pressure of resistance caused by the pipes and equipment
48
an increase in the head pressure results in ______
a reduction of flow
49
What is cavitation
bubbling in the circulation system which can damage the pump
50
What is the required dynamic head capacity for a pump paired with the follow type of filters ``` pressure DE vacuum DE rapid sand high rate sand cartridge ```
``` pressure DE 60ft vacuum DE 20'' vacuum, 40 ft head rapid sand 45 ft high rate sand 60 ft cartridge 60 ft ```
51
a lifeguard must have what type of training?
American Red Cross or YMCA CPR certification
52
pool records must be kept for ___ years
2 years
53
which safety devices must be at a public pool
17 '' maximum life ring | 12 foot minimum body hook
54
what to do for pool fecal/vomit/blood contamination events formed fecal/vomit: diarrhea: blood:
close the pool, ensure pH is 7.5 or lower and water temperature is 77F or higher formed fecal/vomit - maintain FC 2ppm for at least 25 minutes diarrheal stool 20 ppm chlorine for at least 12.75 hours if CYA present: lower pH to 6.5 40 ppm FC for at least 30 hours blood - check if FC is within range, if in range pool stays open backwash filters, replace cartridge filters document incident
55
what is an ancillary facility
areas used in conjunction with pool - locker rooms, pool deck, showers etc.
56
a depth line is required at ____ feet for pools that are deeper than ___ ft
4.5 feet if deeper than 5 feet
57
pools deeper than ___ feet require a no diving marker
6 feet
58
pool/spa decks must be a minimum of ___ feet
4 feet
59
pool enclosure must be ___ feet high with gaps not to exceed ____ inches horizontal bars must be a minimum of ___ feet apart
5 feet high no more than 4'' spacing horizontal bars 4 feet apart
60
chain link fencing can be used if not greater than ___ inches horizontally
1.75 ''
61
what are the pool and spa capacity
spa 1 user per 10 sq ft (surface area/10) pools 1 user per 20 sq ft (surface area /20)
62
studies indicate that swimmers have a higher overall illness rate of non swimmers: regardless of bathing water quality due to poor regulatory practice3 if they are over 50 years old if they swim in pools
regardless of bathing water quality
63
the treatment system of a pool is typically recommended to be installed in which of the following flow arrangements? ``` skimmer/gutter line adjustment valves main drain line hair strainer pump pH feeder filter filter aid pumps adjustable inlets disinfectant feeder ```
``` skimmer/gutter line main drain line adjustment valves hair strainer filter aid pump filters disinfectant feeder pH feeder adjustable inlets ```
64
swimming pool water clarity is measured in NTU or nephelometer turbidity units. It is recommended that a level of 0.5 NTU shall be maintained shall no be exceeded is the minimum is the maximum
shall not be exceeded
65
when mixing acid and water always... add water to acid add acid to water add soda ash to acid stir while pouring water into the acid
add acid to water
66
when chlorine is added to water... one acid is formed two primary acids are formed HCl is considered the primary product ozone is produced in large quantities
two primary acids are formed
67
the best control of swimmers itch at a bathing beach is to add copper sulfate increase the chlorine residual lower the chlorine residual lower the water level and allow plants to dry out
add copper sulfate
68
swimmers itch is caused by
algae growth
69
the preferred method for controlling sewage from watercraft is the use of... onboard holding tanks shipboard discharge incinerator toilet compost toilet
onboard holding tanks
70
the microbe primarily responsible for skin infecitons in whirlpools is e coli pseudomonas aeruginosa shigella sonnet salmonella typhi
pseudomonas aeruginosa
71
water in wading pools should be recirculated every 60 mins 90 mins 120 mins 180 mins
60 mins
72
the following type of swimming facility is generally prohibited home outdoor pool fill and draw pool natural flow through pool recirculating pool
fill and draw pool
73
the main drain should have a grate that is how much larger than the area of the discharge pipe to prevent dangerous suction effets four times five times six times seven times
four times larger

REHS Study (20 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions