Above-Ground Pools

• Above-ground pools are among the most common types of residential swimming pools. They feature a base at or just below ground level and walls that rise up several feet on all sides. The inside of the pool is lined with a synthetic material that keeps the water in, and the pool walls hold up the entire structure, which may also include an attached deck. Above-ground pools cost less than in-ground models, but can still cost thousands of dollars. They have their pump and filter at ground level, making them easy to service and clean.
  
  

In-Ground Pools

• In-ground pools are entirely below ground level. They require you to first dig a hole large enough to contain the pool before pouring a concrete form to hold the water. An in-ground pool's pump and filter may be located underground in a compartment accessible via a hatch or at ground level for easy access. In-ground pools typically cost more than above-ground models, but they also last longer and can feature increased depths. The lack of a ladder for access means that elderly swimmers may have an easier time getting into an in-ground pool. In-ground pools also represent an aesthetic benefit since they aren't visible from a distance and give homeowners more options for landscaping the deck and space around the pool.
  
  

Inflatable Pools

• Inflatable pools are a cost-effective alternative to above-ground pools. They are generally smaller and less expensive but still include an electric filter and pump for circulating and cleaning the water. Inflatable pools use walls and a liner made of a plastic material that you inflate with a vacuum cleaner or air compressor. Inflatable pools fold down for winter storage and usually don't require the building permits that an in-ground or permanent above-ground pool might.
  
  

Wading Pools

• Wading pools are the simplest and least expensive option for the backyard. They feature molded or flexible plastic walls and lack a pump and filter mechanism. This means that you'll need to replace the water on a regular basis to prevent bacteria growth and unsanitary conditions. Wading pools are shallow, often less than one foot deep. Even though manufacturers market wading pools toward children, they can be an effective way for anyone to cool off.