I'm glad you explained how a self-cleaning hot tub that is the fastest at filtering out the water can show that it's one of the most energy efficient options. One that will be energy efficient would be a good choice to not only save money but also help the environment. In order to pick the best option, you'd probably want to research the different types online and see what else the hot tub needs to run best, then consult with a professional when you go to buy it so that you can get information from someone who is experienced with them.