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Impeller is the core part of centrifugal pump, they take water from the pool and throw it out. They are high speed and high output force component.

The discharge function of the pump works like a volute that directs the water flow — it should guide all the water to the outlet pipe after being expelled from the impeller.

As the power source of the pool pump, the motor drives the power source, causing the impeller to rotate.

It connects the center of the impeller to the motor, transmitting its power to enhance rotation.

Seals parts to keep water and debris from reaching the interior of the pump to protect the motor and other internal components.

It spreads disinfectants, algaecides and other chemical agents evenly across the puddle, killing bacteria and algae.

In the case of heated pools, circulation pumps can collaborate with heating systems to maintain the water temperature at a comfortable level for swimming.

Proper water circulation can help you keep your pool water for a long time, which can reduce your maintenance costs.This circulation helps in bringing the impurities and pollutants present in the pool water to the filtration system for treatment and keeps the water neat and clean, thereby establishing maintenance of water hygiene.

Above-ground pool pumps are generally installed above the ground, whereas in-ground pool pumps are installed below the ground (or sometimes in the water).

As in-ground pool pumps are immersed in chlorinated or chemically-treated water, so they may need improved anti-corrosive property than pool pumps used for above ground pools.

In-ground pool pumps typically have higher needs for power and flow rates compared to above-ground types due to their larger volume and longer running times.

Since they are installed within the ground, in-ground pumps might require more strict noise management and might be less user-friendly for maintenance purposes compared to above-ground pumps.

Because in-ground pools contain more water, they usually require stronger pumps and need to run for longer periods. In-ground pool pumps range from 0.75 HP to 3 HP or more (where larger up to 3 HP motors are available if the pool is larger or bigger than usual). Above-ground pumps, in comparison, are smaller and less powerful, typically between 0.5 HP to 2 HP. 

An equally important distinction is the priming process. Most in-ground pumps are self-priming and can also lift water vertically, as most of the pump is located above the water level. But above-ground pumps need to be primed by hand and below the water line, where they offer flooded suction. The difference in priming methods means that this pump might not be as effective if you have an in-ground pool arrangement. 

Its important to note that not all pumps are compatible with existing plumbing systems. In ground pool systems are of an integral design while above ground ones may require different fittings or adapters for proper set up. You need to make sure that the connection is smooth and leak-free, which ensures maximum water travel with minimum maintenance & repairs. 

For inground and above-ground pool pumps, variable speed or dual-speed models will vary the speed of the pump to the desired flow and save energy. If you decide to use an above-ground pump for an in-ground pool, make sure it has energy-efficient features to keep operating costs down. 

Horsepower is one of the most influential factors when it comes to energy efficiency, impeller performance, water flow rate and indicating how well water will circulate in the pool system. A pump with more horsepower is able to give you a greater amount of water flow that is essential in pools with a lot of water features or with a large body of water. But, if the horsepower of the pump is low, the water flow cannot be maintained in an in-ground pool.