There are many things you should look for in a spa review. If you are considering a trip to a new spa, read our reviews to get some ideas on which brands offer the best services. While every spa is different, you should always consider the location and view. In addition, it should be well-ventilated to ensure your spa stays clean. Hot tub sanitation systems use ozone, UV-C light, and chemicals to ensure the water is free of bacteria and other harmful substances.