The best spa jets use a balanced mix of air and water, which ensures optimal massage power - neither too strong nor too weak.
There are different types of jets that offer different types of therapeutic options and sensory experience.
Generally, larger jets are for larger muscles and they deliver gentler water-flow, while narrower jets are for targeted massage and offer a more intense type of massage.
For a soothing, relaxing massage choose rotating single pulse jets, soothing shower jets, or relaxing firm relief jets.
Rapid double pulse jets offer a medium pressure massage for for deep relaxation and stress relief.
For an intense, deep-tissue massage, powerful deep relief jets and target therapy jets will be your best choice.
If you want to make sure the tub has strong jets, look for one two pumps, each with high horsepower.
Remember that too many extra powerful jets can lead to low overall water pressure and unsatisfactory jet performance. Aim for variety.