I talked to a different pool builder yesterday and this guy says he uses pressure treated wood side for vinyl liner pool. Does anyone have experience with using this type of construction???
There is a company near me that have very beautiful all wood pools. Top notch quality. They have had some on display since I was very young so the they must last a long time (I asume the liners need replaced sme as any other) I wish I could afford them though.
http://sunburstpool.com/wooden-pools.html
A neighbor with a pool purchased some used equipment from a guy who had a wood pool. The wood pool was over 40 years old and had finally started to rot. He didn't want to replace it, hence my neighbor's cheap equipment haul.
If done right 40 years is a long time for a pool. I don't know how long steel will last, but in theory concrete should be decades, if not forever if properly maintained.