The National Spa and Pool Institute (NSPI) is the association that supports the spa and pool industry. The NSPI has a Certified Builder course that teaches builders how to build high-quality pools using the latest techniques that meet specifications. Having the certification means that the builder has at least met some standard education requirements to do the job right and it shows the builder's commitment to quality. This one question can weed out a fly-by-night builder from a reputable builder. If the builder belongs to the Better Business Bureau, a Chamber of Commerce, or even a Rotary Club, it demonstrates that the builder intends to be around for a long while.