Chlorine is a sanitizer for pool water. While salt (a saltwater pool via a salt generator) is gaining rapid and exponential growth as a proven sanitizer (and for good reason), chlorine is still the most popular pool sanitizer used today. The main reason for the popularity and longevity of chlorine is that it has passed the ultimate test - the test of time - as a proven sanitizer for pool water.
As a sanitizer, chlorine will destroy and remove bacteria, pathogens, organisms, algae spores, dirt, debris, particles, and other contaminates from pool water as well as help to oxidize organic matter in the pool water so that the end result is clean, clear, and safe water. Sanitizing the pool is a requirement for maintaining optimal water chemistry and the resulting water clarity.
Chlorine is a proven sanitizer. If you have a history with chlorine, if you are comfortable with chlorine, and if you are satisfied with the results of chlorine, then use chlorine to sanitize your pool.
You can read the Pool Manual for additional information about chlorine and sanitizing pool water.