I forgot to add, that even for a "simple" in-ground pool, ie, no spa, no water features, just say a 16x32 in-ground with a deep end, around 18-19k gallons, you will have huge filter systems (300+ sq/ft), big pumps (1.5-2hp+), at least 2 returns, 2 skimmers and a main drain arrangement. Why would you want the same setup on a 27ft x 54" 20k gallon pool???

I know, I know, a lot of equipment is oversized (such as filters and pumps) for their app, but it seems that above ground pools are viewed as "cheapie, who cares, doesn't matter, it is throw-away after-all" type of attitude... And in the end, there is little difference except for the up-front expenditure... Same size body of water and same chemicals needed to maintain them regardless of in-ground and above ground...

Just like it seems "viable" to have a booster pump and pressure side cleaner for an in-ground, but seems absurd for an above-ground. Again, why?