The Association of Pool & Spa Professionals (APSP)

The APSP is a national trade organization. There is some consumer information available on this website. However, they have three other sites that are owner orientated:

Pool People USA is intended for the pool owner.

Hot Tub Living is intended tor the spa and hot tub owner.

Splash Zone USA is designed for elementary school age kids. The FLASH site works better than the HTML site.