There are many things to consider when hiring aswimming pool service. First of all, the technicians should be background checked. In fact, the law says they have to be. If a service doesn't have a business license AND a special business license, it's probably because they can't pass the background check to get them. Think about that. You should also expect that the same technician is coming out to service your swimming pool regularly. It's understandable if someone fills in from time to time, but the best service is provided when you have a technician who knows your pool inside and out.