Here's a great example of a conventional pool turned into a natural swimming pond. They offer a much lower maintenance alternative to conventional pools and allow you to swim in clean, chemical free water.
Money-saving Hacks Of Creating Best Diy Pool(Diy Furniture Patio)
30 Breathtaking Natural Swimming Pools by Biotop | http://www.designrulz.com/outdoor-design/garden/2013/04/breathtaking-natural-swimming-pools-by-biotop/
Above ground pool with deck
Very beautiful garden and swimming pond!