Pump pressure drop

[Tman122]

The problem with using a gauge to check pressure at the jets is if you put a gauge on a jet, or plug a jet with a gauge the pressure from that jet is just diverted to the other jets.

[lehacf]

So how do technicians do that? Read the value from the pressure sensor? Grow sensitive cells on the palms of their hands? Or are just simply convincing customers that everything is fine?

[av8r]

I asked 2 local spa techs and after they stopped laughing they asked what good a pressure gauge would be when no one has a baseline to work from?

No offense, but you're making owing a spa sound like work!

[Tman122]

So how do technicians do that? Read the value from the pressure sensor? Grow sensitive cells on the palms of their hands? Or are just simply convincing customers that everything is fine?

The GPM (gallons per minute) at the pump minus the value of the friction from the plumbing, measured at the jets. The big players in the industry have a team of engineers to work on this stuff. Usually they just give you the GPM value output of the pump before tubing, manifolds and jets. For advertising purposes. Or they just say "full power at all jets pacs"