we had 1 in st/geo(10 years ago)it was12x24 and cost me 11000$ instaled,all the concrete/plum/filters,filled up and ready to go.i paid 700$ extra to have it put 3 1/2" lower in the ground and the concrete came over the edge like a plaster pool does,never had any probs it worked great(and still is,i know the people that bought my house).also they stay warmer and easier to clean.if i ever do 1 again,i will do it myself, i watched then do mine and the hardest part was the leveling,once its level you start filling with water(slow checkn the level as you go)and back fill the dirt with the water and make sure the water and dirt stay the same as you fill