What can happen if sanitizer levels drop too low?

When sanitizer levels in a swimming pool drop too low, the primary consequence is the potential for the growth of algae and bacteria. Sanitizers, such as chlorine or bromine, play a critical role in maintaining water safety by killing harmful microorganisms and preventing algae proliferation.

A reduced sanitizer level means there is insufficient capability to effectively combat these microorganisms, leading to possible health risks for swimmers, such as skin infections or gastrointestinal illnesses. Additionally, low sanitizer levels create an environment where algae can thrive, making the water cloudy and unappealing, and requiring more extensive treatment to restore balance.

The other options suggest positive outcomes or benefits that are not associated with low sanitizer levels. For instance, increased water clarity generally results from properly balanced and appropriately maintained sanitizer levels. Improved swimming comfort is linked to well-maintained water conditions, not a deficiency in sanitization. Similarly, a decrease in chemical usage is only valid under circumstances of effective management, not when sanitizer levels are insufficient. Thus, the consequence of low sanitizer levels is ultimately the increased risk of algae and bacterial growth, necessitating a vigilant approach to pool maintenance.