A spool can refer to two different things: a small pool design created as a solution to having a swimming pool fit for a small backyard or limited space, or a cylindrical device with a rim or ridge at each end and an axial hole for a pin or spindle and on which material (such as thread, wire, or tape) is wound. In this context, we will focus on the definition of a spool as a small pool design.

A spool pool is a smaller pool with spa-like features, resembling a large hot tub but with powerful directional jets that create a current against which you can swim. It is also known as a cocktail pool or plunge pool and is half as long as a lap pool, which is designed for full swim laps. Spools are typically 10-16 feet long and 6-8 feet wide, making them ideal for restricted spaces or oddly shaped backyards. They are much smaller than in-ground swimming pools but nearly twice the length of an average spa. Spools can be customized to any size, but they are generally smaller than traditional swimming pools.

Spools are versatile and can be used as a spa, pool, or both. They offer some of the same advantages that swimming pools and hot tubs have, but they also come with some disadvantages. For example, they are more affordable and easier to install and maintain than full-sized pools. Spools can also be installed indoors and used year-round in mild climates with adjustable temperature. They are also a great workout option for those who like working out, as the powerful jets can create a current to swim against, which is a great alternative to lap pools.

In summary, a spool is a small pool design created as a solution to having a swimming pool fit for a small backyard or limited space. It is a versatile alternative to swimming pools as it allows you to enjoy cool water on warm days and a hotter temperature for a therapeutic experience in the evenings.