Underground tank stores sanitized and filtered water just like a pool. When you’re ready for fun, turn a valve and the water will begin flowing thru the bubblers and jets automatically changing flows and directions. You can adjust the speed, height and number of jets to meet the number and age of the kids playing. The water will then drain and return to the storage tank where it waits to be filtered, sanitized and re-used. BYSP jets can easily be changed from single stream to a shower, bubbler or fan pattern.