I just have one skimmer, so just one return pipe to the pad. My return goes through the solar and out two eyeballs.
Here are my Intelliflo stats;
1100rpm - 5 1/2 psi - 187 watts
1700rpm - 11 psi - 312 Watts (current recycling speed)
2150 rpm - 16 psi - 600 Watts (solar)
The external diameter of my plumbing is 2 1/4" and the only different plumbing is the booster at 1 3/4"
Thanks very much for any/all assistance!