Natural Swimming Pool/Ponds (NSP's) are a chemical-free, low-maintenance alternative to traditional chlorine pools. The water is clean, crystal-clear, and filtered naturally using a built-in biological filter. by kathrine
Natural Pools Are Making a Ripple, But Are They For You?
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.