Is chlorine harmful to fish?

Chlorine is indeed harmful to fish and other aquatic life. This is due to chlorine's chemical properties, which can disrupt the gill function of fish, leading to stress, respiratory problems, and even death at elevated concentrations. Fish have a very low tolerance for chlorine, and exposure to chlorinated water can result in negative health effects.

Chlorine's harmful effects stem from its ability to react with organic matter present in water, forming potentially toxic byproducts. Consequently, even low levels of chlorine can be problematic, especially for sensitive marine species.

Understanding the toxicity of chlorine is essential for water treatment processes, particularly when considering the aquatic environments that are often downstream of treatment facilities. The importance of managing chlorine levels carefully is underscored by its potential to adversely affect fish populations and aquatic ecosystems.