Gene Trumbull, the owner of CustomBuiltSpas.com, has put together the definitive CD-books on building your own spa or hot tub... and saving thousands of dollars in the process. You won't find this information in such a complete and organized form anywhere!
Discount Spas Direct is the US and Canada's largest hot tub manufacturer that specializes in hot tubs, hot tub accessories, hot tub cover and hot tub parts. Site includes a "virtual tour" that describes the manufacturing process from acrylic sheet to finished hot tub.
Hawaiian Pool Builders is a residential swimming pool builder and commercial swimming pool builder in Ohio, Michigan, Indiana, and Pennsylvania.