Finally got in our new spa this evening and the Jets were really unimpressive. We have a 9' inground spa with a total of 10 jets. 6 of the Jets are connected to my Pentair VS pump, the other 4 are connected to a Pentair Whisperflow 2HP. The Jets connected to the Whisperflow feel stronger than the VS but even those aren't all that strong. On spa mode I have the VS set at 3450 rpms and they jets are still weak. Could the return fittings be the cause of the low pressure? Four of the jets have two rotating holes, all the other jets have fittings that are flush with the plaster with a pretty large opening.
Any ideas how I can get stronger jets?