The Swimmercise Pro 17 offers the same six fitness jets and 36 hydrotherapy jets as the Swimmercise Pro 15, but it gives you more space to work out and lounge, offering a full 17 feet. 14' x 7'8" x 4'8" - 36 hydrotherapy jets; full body massage columns, reclining and sculpted seats with shoulder, upper and lower back, hips,calves, and feet jetting - 2,420 Gallons