I like TigerFlex flexible PVC. You use this EXACTLY the same way as hard PVC--glue on Schedule 40 fittings. Be sure to use the blue glue.

What I really like about TigerFlex is you can mix and match it to suit your needs with hard PVC.

Here's an example: How I re-plumbed my return. The black corrugated hose goes to my solar panels. I've since re-done this, but everything to the left of the corrugated is the same. You can see how the T/F ties to the hard PVC at the return. All of this pops off in seconds at the end of the season and the T/F can be easily manuevered out of the pool's structure--it's flexible.



Now here's the way I used both around the pump. The vertical from the pump is T/F, and the horizontal is hard PFC. The T/F gives me some flexibility, but the hard keeps it up and looking cleaner. Additionally, the hard PVC comes out of the filter for the return, then changes over to T/F.