Disinfection and Sanitizers Flashcards
7 cards from real CPO practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Disinfection and Sanitizers flashcards as text
Why is bromine often preferred over chlorine for indoor spas and hot tubs?
Answer: Bromine remains effective at higher temperatures and a wider pH range
Bromine is stable at the elevated temperatures of spas (above 104°F) and remains effective at higher pH levels where chlorine loses potency.
A saltwater chlorine generator (SWCG) system sanitizes pool water by:
Answer: Electrolyzing dissolved salt to continuously generate free chlorine
A SWCG passes salt water through a electrolytic cell, splitting NaCl into sodium and chlorine, which forms hypochlorous acid in the pool.
Ultraviolet (UV) disinfection systems installed on commercial pools are classified as:
Answer: Secondary treatment systems that reduce chemical demand but still require a chemical residual
UV systems destroy pathogens in the recirculation line but provide no residual protection in the pool water, so a chemical sanitizer must still be maintained.
Ozone (O₃) used in pool water treatment:
Answer: Must be combined with a residual chemical sanitizer because ozone dissipates before reaching the pool
Ozone is a powerful oxidizer in the equipment room but breaks down quickly and cannot maintain a disinfectant residual in the pool itself.
Which of the following sanitizer systems leaves ZERO residual disinfection protection in the pool water?
Answer: Ultraviolet (UV) light systems
UV light disinfects water only as it passes through the UV chamber; it provides no residual sanitizer in the pool water itself.
What is the typical salt concentration required to operate a saltwater chlorine generator (SWCG)?
Answer: 2,700–4,500 ppm
Most SWCG systems are designed to operate optimally with a salt concentration of approximately 2,700–4,500 ppm (about one-tenth the salinity of seawater).
Biguanide (PHMB) sanitizer systems are incompatible with which products?
Answer: Chlorine and bromine disinfectants
Biguanide (PHMB) chemically reacts with chlorine and bromine, causing cloudy water and system failure; they must never be combined.