This page will give the newcomer to spa mechanics a basic understanding of how a hot tub's water heating, circulating, ozone and filtering systems work. Even if you never work on your own spa, understanding how it works will make ownership a more trouble-free experience in the long run. D Near the water line, many spas have a skimmer basket, which is designed to trap larger debris, such as hair, grass, leaves, etc. before it can reach other components and cause problems.
Many spas filter the water before it reaches other components.
The spa pump may be located before the filter or after. Some spas have more than one pump, and a pump may have 2 speeds. Your spa may also be equipped with an air blower that can provide a tingling flow of air bubbles up through the bottom of the spa, or mixed in jets. It may or may not be located near the pump. Many spas have adjustable topside air controls, which introduce air into the jets.