Whirlpool tubs initially grew to become well-liked within the U.S. during the sixties and seventies. A spa is also known as a "jacuzzi" there, given that the term became a generic soon after-plumbing part manufacturer; Jacuzzi released the "spa whirlpool" in 1968. Air bubbles could be introduced to the nozzles https://pool.net/stahlwandbecken-pool/