CPI Commercial Pool Operator Standards 2

Question 1

What is the minimum required turnover rate for a commercial swimming pool under most state health codes?

Accepted Answer

6 hours

Answer

Most state codes require the entire pool volume to turn over (be recirculated through filtration) at least once every 6 hours for swimming pools.

Question 2

A commercial pool operator discovers the CYA (cyanuric acid) level is 120 ppm. What is the most appropriate corrective action?

Accepted Answer

Partially drain and refill the pool

Answer

When CYA exceeds recommended levels (typically 30–50 ppm), partial draining and refilling with fresh water is the only effective way to dilute it.

Question 3

Under ADA requirements, which of the following is an acceptable means of pool access for persons with disabilities in a newly constructed commercial pool with over 300 linear feet of pool wall?

Accepted Answer

At least two accessible means of entry

Answer

ADA requires that pools with over 300 linear feet of pool wall provide at least two accessible means of entry, such as a lift and a sloped entry.

Question 4

What does a high combined chlorine (chloramine) reading above 0.2 ppm typically indicate in a commercial pool?

Accepted Answer

Inadequate chlorine to oxidize nitrogen-containing contaminants

Answer

High combined chlorine indicates that free chlorine is reacting with nitrogen-containing bather waste (urine, sweat) and is not present in sufficient quantity to fully oxidize these contaminants.

Question 5

Which type of filter medium requires the highest operating pressure before backwashing is needed?

Accepted Answer

DE (diatomaceous earth) filter

Answer

DE filters operate at lower initial pressures but have very fine filtration, so they can actually reach backwash pressure thresholds more quickly; however, cartridge filters have no backwash cycle and DE filters require backwash at a 7–10 psi rise — the principle is the same for sand but DE achieves finer filtration.

(CPI) Certified Pool & Spa Inspector Practice Test

(CPI) Certified Pool & Spa Inspector Practice Test

CPI Commercial Pool Operator Standards 2