Hot Tub Plumbing

Main Drains

If your spa also has a main drain, it will be connected to the skimmer, and then both units are connected to the pump. A three-port valve is used to adjust the amount of suction taken from the main drain and the amount taken from the skimmer.

In some spas, there may be more than one main drain, so that if one becomes covered with a foot or hand, water will be pulled from the other, avoiding injury to the bather. These drains are located at least 12 inches (30 centimeters) apart. Because spas are relatively shallow, strong suction can create a whirlpool effect. To prevent this, many spa main drains are fitted with antivortex drain covers, which are slightly domed-shaped with the openings located around the sides of the dome.

Equipment alone can't prevent accidents. Children playing around the main drain or even casually placing feet or hands over the suction can be injured. Long hair can easily become trapped. The best way to avoid such accidents is to be sure that anyone using the spa has been given adequate training and warnings; that appropriate warning signs are posted; and that the safety covers and other equipment designed to prevent accidents are maintained at all times.

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