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29 Cards in this Set
- Front
- Back
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Water skimmers are required for every how many m2 |
Every 40m2 |
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Where are hair and lint catchers installed |
Ahead of the recirculating pump when pressure filters are used and ahead of vacuum cleaner pumps |
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What is the recommended pH level |
6.8 to 7.6 |
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What are the most common piping materials |
PVC and copper |
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How is chlorine added to public pools |
Gas feed chlorinators |
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Swimming pools must be tested for |
PH and chlorine |
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What is the name given to diatomaceous earth mixed with water |
Slurry |
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How many water closets are required for swimming pools |
1 for every 25 people |
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How many complete water changes are required for public pool |
6 every 24 hr (Every 4hrs) |
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Where must a drinking fountain be located |
At the shallow end of the swimming pool |
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How many showers are required |
Minimum of 3 1:50 |
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What is commonly added to raise pH level after adding chlorine |
Soda ash |
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Open filters use what filtering media |
Diatomaceous earth |
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What factors determine the capacity’s a swimming pool pump |
Size of pool Number of water changes in 24hr Maximum number of bathers |
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When is backwashing off a filter required |
When negative pressure of 35 to 58kpa is indicated on the pump suction |
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A gas chlorination must be able to supply how much chlorine per 45m3 |
1.3kg |
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What percentage of water should come from the top of the pool through skimmers/gutters |
50% |
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Define the term “residual chlorine “ |
Total chlorine - free chlorine = residual chlorine |
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What is the best pH level for swimmer comfort |
7.4 |
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What treatment method may be used to remove taste and odor |
Super chlorination |
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During super chlorination the chlorine level is brought up to between |
6 and 10mg/L |
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At what temperature should pool water be kept between |
24 and 26C |
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Wading pools should be changed |
Once every two hours |
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Water tests are performed every |
4 hours |
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Alum may be added to the water after what piece of equipment and before what piece of equipment |
After hair catcher and before makeup tank |
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Gauges are installed where on pumping equipment |
On either side of the pump Inlet and outlet of the filter |
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When sand filters of any type are used, what should be added to the water as it returns from the pool |
Alum |
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What type of pumps are used |
Centrifugal |
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How many hose bibs should be installed |
1 in each dressing room 1 on the pool deck |
