Hot Tub Jets

I went to a pool party yesterday and sitting in the hot tub made me wonder how a hot tub actually works. So, I looked it up on the internet. It turns out that there is a lot of physics involved in the functioning of a hot tub. I learned that a hot tub works by pulling water through a system of pipes and through a heating device before ejecting the water into the tub. Some kind of suction or pressure filtration system draws the water from the hot tub and into a filter. The water is checked for impurities, goes through a pump, and finally, the water gets filtered. After getting filtered, the next step in the process is heating the water. The water is heated to a certain temperature, and there are flow switches and an overheating switch that are used to control the temperature and flow of the water. The water then passes through pipes before reaching the jets. Today, the jets of hot tubs use air induction, which allows warm water to mix with air, to make the stream of water from the jets extra strong. Now I know the sort of physics that goes on in producing the stream of water from hot tub jets.