I'm putting my Stenner in and was hoping for help with a fast question on where to tap in for the injection quill. In the picture below, the pipe with the red line is the main return line going from the heater to a Jandy valve (the valve splits between the spa jet returns and the pool returns - the right side that goes to the pool returns also has one "feature"return that comes up through the floor of the spa, so the spa still gets some return water when the Jandy is set to the right side).
Am I correct that I should tap in for the injection quill somewhere along the red line? Thanks for any help or input.
Stenner_tap_location - v01.jpg