"Chlorine levels" refers to the amount of chlorine present in a particular substance, such as water. It is used to measure the concentration or quantity of chlorine present. Full definition
High chlorine levels in water have also been shown to decrease vitamin E levels in the body and destroy beneficial intestinal flora. (mindbodygreen.com)
One of the employees studied my daughter's notes and identified the invisible killer to be unsafe chlorine levels within our drinking water. (spnetwork.org)
Chlorine test strips (0 to 500 ppm range): A quick and non-hazardous way to measure Free Chlorine levels in produce wash or other water. (postharvest.org)