All swim Spas are built with some difference. I am a Spa Tech and I have prepared a list of Quality reviews for what to look for in Swim Spas....especially a) what equipment is used , the jets used, and where equipment and pumps are located for service. This is all very important. I have installed numerous Swim Spas inground and on top of ground. Feel free to ask any questions and I will try to answer with Helpful information!