Dive Into Success: 2026 Certified Pool Operator Practice Test – Make a Splash!

The appropriate response for the immediate closure of a pool or spa pertains to pH levels being excessively high or low. When the pH level reaches 8.0, it is not in the ideal range for safe swimming. Highly alkaline water can lead to skin and eye irritation for bathers, reduce the effectiveness of chlorine in disinfecting the water, and can contribute to the formation of scale. Maintaining the pH level between 7.2 and 7.8 is critical for both the comfort of swimmers and the holistic functioning of pool chemistry. Therefore, a pH of 8.0 would necessitate immediate action to lower the pH before reopening the facility to the public.

In contrast, chlorine levels at 2.0 ppm are typically considered acceptable for maintaining sanitation, temperatures above 90°F can be managed within the operational guidelines of many facilities, and alkalinity at 120 ppm is generally within an acceptable range, provided it aligns with the overall water chemistry balance. These conditions, while they may require monitoring and adjustments, do not necessitate immediate closure.