Which of the following is NOT a method for sanitizing pool water?

The choice of alkaline enhancement as an answer reflects an understanding of pool sanitation methods. Chlorination, ultraviolet light, and bromination are all recognized methods of sanitizing pool water.

Chlorination involves the addition of chlorine to pool water, which effectively kills harmful microorganisms and prevents algae growth. Similarly, bromination uses bromine as a sanitizing agent, an alternative to chlorine that also serves to eliminate pathogens and maintain water clarity, particularly in warm water pools.

Ultraviolet light systems work by using UV radiation to neutralize bacteria and viruses as the water passes through a chamber exposed to UV light. This method is effective and is often used in conjunction with chemical sanitizers to enhance overall sanitation.

On the other hand, alkaline enhancement refers to the process of adjusting the pH and alkalinity levels of pool water, which is important for water balance and comfort. However, it does not serve as a method for sanitizing or killing pathogens in the water. Therefore, it is correctly identified as not being a method for sanitizing pool water, distinguishing it from the other provided options.