– Pool chlorine does not work right away. The fact is, according to Healthy Pools, that “chlorine kills germs that can cause illness in pool water; but it takes time. While chlorine eliminates most within minutes, some germs such as Cryptosporidium can survive in a properly treated pool for days.” So if you want to swim and you want to make sure your pool water is properly disinfected, plan ahead.

Read Related: Pool Safety Tips & Rules Every Parent Should Know