Quote Originally Posted by msm859 View Post
I do not profess to be an expert however, from what I have researched 2 hp pump is too big for your spa. only so much gpm can go through your pipes. what size is the plumbing to the spa? how long is the run, how many 90's? etc. I might look into the Pentair Intelliflo -- which is a variable speed pump. my guess w/ a 2 hp pump you will be throttling way back which is just wasting energy making your pump work harder.
Spa jets generally require 15 GPM per jet for adequate action. With 6 jets that is 90 GPM. A spa shared with a filter and heater even with 2 1/2" pipes is likely to be above 65 feet of head loss so a Hayward Northstar full rated 2 HP would yield about 110 GPM or 18 GPM per jet. However, 2 HP max rated would yield about 90 GPM so it really depends on the pump rating as well as what the user likes, strong or weak jets.

However, a dedicated jet pump without filter and heater head loss would not need to be as large.