There are numerous ways to measure HP – True horsepower, showing constant running power and Break horsepower (BHP) which is the rating for less than one second when the motor peaks and burns out. Of course, only the True horsepower rating is the one that counts, but that still doesn’t ensure efficient plumbing and use of the power. Ensure that your spas is PSI rated at every jet, and gives you 12 – 14 PSI which provides true therapeutic massage, optimum equipment performance and reliability.