Therapy spas have been used for many decades around the world with amazing benefits. The M. E. D. therapy spa provides warm water with a depth of about 2 feet with no seating obstructions, and should be at least 5 to 6 feet in diameter. There are also 1 inch massage jets to further relax the muscles and joints with the percussion effect from the water coming out of the jets. Bath tubs and whirlpools are not deep enough, and not wide enough to provide the benefits of a M. E. D. Spa. There are 3 main benefits at work in a M. E. D. Therapy Spa. One is Massage. The second is Exercise. And the third is Decompression, which is why it is called a M. E. D. Spa.