If you are considering building and swimming pool, now is the time to act. Most Pool Builders offer discounts on pools purchased in the winter so they can be installed in the late summer or spring when pool activity is usually low. But before you decide when to buy, you need to decide what to buy. Let's take a quick look at the two most popular types of pools. Concrete Concrete pools often called shotcrete or Gunite pools, are the most popular and most expensive type of pool. Although it has a longer duration than other types, concrete is considered to be the strongest and most durable type of pool. And unlike other in-ground pools, existing concrete or Gunite pools can be reconstructed, refinished, enlarged, modernized, or restructured. Vinyl Vinyl-lined pools are the second most popular pool in the country, and the number continues to grow.. Vinyl pools are limited in size and shape. Most are rectangular, but we also have L-shaped and raised. Choosing an inground p