Certified Pool Operator Practice Test

A strong chlorine odor and eye irritation in an indoor pool area is most likely caused by high levels of chloramines. Chloramines are formed when chlorine combines with ammonia and other organic compounds, and they can irritate the eyes and respiratory system.

Low pH levels may also cause eye irritation, but they would not typically result in a strong chlorine odor. High total alkalinity and high calcium hardness can both affect the clarity of the water and may contribute to eye irritation, but they are not the most likely cause of a strong chlorine odor.