First major upgrade I've done. Got the old pump out and got an Intelliflo VS plumbed in AND successfully wired up. I was a little worried about that piece but it went smoother than the re-plumb.
Fired the pump up and darned if there aren't bubbles from the returns and the pressure side cleaner just floats in the pool. I only have one suction line coming out of the ground (I assume main drain and skimmer merge at some point), so I'm thinking the only thing that could be the problem is the union I put in right at the pump inlet. I think I may have gotten too aggressive tightening it and probably stripped it. In the meantime, I've tried thread sealant and teflon tape, neither of which changed the bubble output.
Am I right to suspect the union? There were no bubbles with the old pump and one of the many things I've learned on this forum is that bubbles happen on the suction side.
Anything else to check before I replumb the union on the suction side?