- Hot Tubs and Spas
 - Offers hot tub and spa information including spa and hot tub diagrams, placement, and benefits. - Consumer Product Safety Commission: Spas, Hot Tubs, and Whirlpools
- Outlines dangers of, and methods for avoiding, hair entanglement and body part entrapment in spas, hot tubs, and whirlpools.
- Hot Tub Info Central
- Offers advice about construction, pricing, sales techniques, and more.
- Spa & Hot Tub Filter Information
- Includes cleaning and troubleshooting advice.
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