pressure differential between spa and pool return lines


Platinum Supporter
LifeTime Supporter
In The Industry
May 9, 2011
I have a pool where the pressure rises about 20 psi when the return lines are on the spa. On most pools the pressure rises about 10 psi when the returns are on the spa. The other abnormality on this pool is that the jets in the spa will go in and out, there will be pressure on a jet and then it will completely stop for a few seconds and then the pressure returns. Any ideas on what might be going on here?


Gold Supporter
TFP Guide
Jul 21, 2013
Northern NJ
Pool Size
Salt Water Generator
SWG Type
Pentair Intellichlor IC-60
I don't view the pressure rise when in SPA mode alone an abnormality.

How many jets does the spa have?

Show us pics of what the jets look like.

What size are the jet orifices?
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