Blue Glue seems to be recommended for pool plumbing joints, espec TigerFlex.

It's basically PVC glue but it's bright blue. I gather it's also more flexible, making it ideal for TigerFlex. Further, you can CLEARLY see (and so can the inspector) that the joint is completely glued. You work with it EXACTLY as you do with clear glue.

You can see it on the joints around my filter and pump.