While several of these are from Europe, there are companies around the world that specialize in natural pools. But how do these pools stay clean? There are various low-to-zero chlorine options, including a specialized filter containing coated titanium plates and copper and zinc ions by TechnoPure and ozone injectors by DEL Ozone, that reduce the need for chlorine by up to 90%. The most green option however, is constructing a swimming pond that includes aquatic vegetation for natural filtration and aeration of the water. A waterfall can ensure water movement to prevent mosquitoes, and UV sterilizers can kill any potentially dangerous germs. Kansas-based Total Habitat specializes in this type of swimming pond.
For complete sideshow of all 23 pools, please visit TheDailyGreen.com. I've selected a few of my favorites below:
You won't find much (if any) chlorine in these pools. In fact, you may even find plant life and other organic material, which help naturally filter the water.