CPO Disinfection Systems & Sanitization Methods 2

Question 1

How does ultraviolet (UV) disinfection work in pool water treatment systems?

Accepted Answer

UV light penetrates microorganisms and disrupts their DNA, preventing reproduction

Answer

UV rays raise water temperature, killing bacteria through heat

Answer

UV energy converts chlorine into a more potent disinfectant form

Answer

UV radiation raises ORP levels, replacing the need for any chemical sanitizer

Question 2

What is a key limitation of ozone (O₃) as the sole pool sanitizer?

Accepted Answer

Ozone provides no residual disinfectant in the pool water after treatment

Answer

Ozone is too weak to kill Cryptosporidium

Answer

Ozone dramatically raises pool water pH above safe levels

Answer

Ozone requires excessively high salt concentrations to be generated

Question 3

A saltwater chlorination system (electrolytic chlorine generator) produces chlorine by which process?

Accepted Answer

Passing an electrical current through sodium chloride (salt) solution to generate hypochlorous acid

Answer

Dissolving trichlor tablets in concentrated brine before injection

Answer

Reacting liquid CO₂ with pool salt to form hypochlorite

Answer

UV-activating salt ions to release chlorine gas into the water

Question 4

What is the function of cyanuric acid (CYA) in an outdoor pool?

Accepted Answer

It acts as a chlorine stabilizer, reducing UV degradation of free chlorine by sunlight

Answer

It raises total alkalinity to buffer pH swings

Answer

It softens hard water by sequestering calcium

Answer

It replaces the need for shock treatments in outdoor pools

Question 5

At what cyanuric acid (CYA) level does pool health guidance generally indicate that chlorine effectiveness becomes significantly compromised, requiring dilution or draining?

Accepted Answer

Above 100 ppm

Answer

Above 25 ppm

Answer

Above 50 ppm

Answer

Above 200 ppm

Question 6

What does Oxidation-Reduction Potential (ORP), measured in millivolts (mV), indicate about pool water?

Accepted Answer

The overall sanitizing power or disinfection effectiveness of the water

Answer

The total dissolved solids concentration in the water

Answer

The amount of combined chlorine (chloramines) present

Answer

The calcium hardness level and scale-forming tendency

Question 7

Which alternative sanitizer system, sometimes called a 'mineral system,' uses silver and copper ions to inhibit algae growth and reduce the chlorine demand in pools?

Accepted Answer

Copper-silver ionization system

Answer

Biguanide (PHMB) system

Answer

Bromine tablet feeder system

Answer

Hydrogen peroxide oxidation system