In simplest terms, an above ground pool pump is a flooded suction pump, which means the water level must be higher than the pump for it to operate, and an inground pump has the ability to draw water up from a level lower than the pump. The engineering and structure of these two different types of pumps is what makes them work the way they do. This means that, in a typical installation, you could use an inground-specific pump on an above ground pool, but not an above ground pump on an inground pool with the water level below the pump.
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In simplest terms, an above ground pool is built the handle the water pressure exerted from the inside but not the pressure of the ground around the outside. It takes the special structure of a pool built for burial in order for it to not collapse when placing it into the ground and backfilling.
In simplest terms, an above ground pool pump is a flooded suction pump, which means the water level must be higher than the pump for it to operate, and an inground pump has the ability to draw water up from a level lower than the pump. The engineering and structure of these two different types of pumps is what makes them work the way they do. This means that, in a typical installation, you could use an inground-specific pump on an above ground pool, but not an above ground pump on an inground pool with the water level below the pump.
In general, an above ground pool costs from 10 to 20 percent of what it costs to install a comparable sized in-ground pool. Further benefits are that it is easier to prepare for overwintering, easier to heat, and it will not add to your property's assessed value.