I applied online. The process took 2 weeks. I interviewed at Crystal Aquatics in Nov 2017
Interview
Very easy, the interviewer did not ask a lot of questions/very hard questions. Was pretty quick and then I was quickly hired after that. Didn't need to prepare at all and it was fine.
You call them and set up an interview when you are able to. The interview is very chill and easy. They will just ask you a few questions and tell about being a proper lifeguard.