To add to what Ben said, the filter is the most important part of your pool. In my forty plus years of installing above grounds I have had plenty of access to free used pools. People pay me to remove them from their yards when they are tired of them. Whenever I needed a pool I had access to a free one. I would add to it the cheapest liner I could find. During the internet age it would be the cheapest blue 20 gauge I could find. I know how to take care of a liner and get the most out of them. If I had to change it in five years, the new liner was cheep and the labor free. The only place I was picky was what I used to clean the pool with. I have always used top notch filter equipment and my kids always swam in sparkling clean water. They did not care whether or not there were fish all over the liner, or whether there were huge 8" resin top seats surrounding them. Actually, these were not options when I was raising kids, but anyway, they always had sparkling clean water to swim in.

The filter equipment you choose will have a direct bearing on how much enjoyment you get out of the pool.

Later, Dennis