Recreational Water

Question 1

Which has the most available free chlorine?

Answer 1

Chlorine gas

Question 2

What is the cause of swimmer’s itch?

Answer 2

Schistosomes (Trichobilharzia spp. most common)

Question 3

What is the cause of hot tub rash?

Answer 3

Pseudomonas

Question 4

At what temperature should you store a pool chemical test kit?

Answer 4

36°F-85°F

Question 5

What happens if alkalinity is too low in pools?

Answer 5

Damages pool
Unstable pH
Chlorine is less effective
Results in acidic water: irritation of eyes, nasal passages, and skin.

Question 6

What is the maximum temperature for a spa?

Answer 6

104°F (40°C)

Question 7

What do you do when you have a Diarrheal Fecal Incident?

Answer 7

1. Close pool
2. Remove fecal matter
3. Raise free chlorine concentration at 20ppm with pH of 7.5 or less for 12.75 hours to achieve Crypto CT inactivation value of 15,300
4. Confirm filtration system is operating
5. Backwash filter thoroughly after reaching CT inactivation value.
6. Replace filter media, if appropriate.
7. Establish fecal incident log

Question 8

What do you do when you have a Formed Fecal Incident?

Answer 8

1. Close pool
2. Remove fecal matter
3. Maintain free chlorine concentration of 2ppm at pH 7.5 for 25-30minutes to inactivate Giardia.
4. Confirm filtration system is operating
5. Establish fecal incident log

Question 9

What temperature is chlorine most effective?

Answer 9

78°F

Question 10

What is the appropriate level of cyanuric acid in a swimming pool?

Answer 10

30-50ppm

Question 11

What is the recommended levels of free chlorine in pools?

Answer 11

1-4ppm (from EPA website)

Question 12

What is cyanuric acid for?

Answer 12

Chlorine stabilizer

Question 13

How long should public pools run their filtration system?

Answer 13

At least 1 turnover per day

Depends on the pool: 8-12 hours minimum (turnover rate for public pools)