Just thought I might chime in..I have been in the aluminum extrusion industry for 20 years now. I looked at a Johnny W. pool a few years ago and it was the first aluminum pool I have ever seen. It was a simple interlocking extrusion that made the wall. At one time and maybe still now, Arch Aluminum extrudes for them. We looked at getting into the pool wall extrusion business, but we decided not too because our focus is mainly architectual shapes.
I have a 5 year old 24' above ground steel pool myself and it has been very reliable. We put a new liner in this season and when I checked the walls they were in perfect condition, no rust at all. I think either with steel or aluminum, the pool, if installed correctly will last many years, so if you can get an aluminum pool for the same price as steel I would probably go that route. The aluminum extrusion pool walls metal thickness is greater than a steel pool wall, that is mainly to get that particular shape to run flat when extruded. I believe those pools are painted which I would prefer over an anodize finish (we do both in my plant). Paint will do a better job protecting against oxidation, and if the extrusions are powder coated they will even be more protected than with wet paint.
So either way having the pool installed correctly will be of more importance than the type of metal it is made of.
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