These are generally more expensive than concrete pools but have a better lifespan because fiberglass pools are easier to maintain, requiring fewer chemicals. Fiberglass pools also eliminate the need for future re-plastering and liner replacements thus reducing your expenses in the long run. Construction time is roughly about two weeks. A pool is furnished to the installer in kit form. Panel walls are joined together and a concrete footing is placed at the bottom for support. Construction time is about one to three weeks. The spa pools Northland are the most common types as these are more durable and can be custom-built to your needs and specifications. Concrete pools have the advantage of flexibility in design, shape and depth at the initial stages of construction. For more info, visit at:- 7 Morningside Road, Morningside, Whangarei 0110, New Zealand.