I would love to build a natural swimming pool like this.
Natural Swimming Pool
"Swimming in natural water is a delight to our senses. Your skin and hair feels soft and your eyes don't sting. It seems as if, every cell in your body is telling you - this is the way swimming should be. A Natural Swimming Pool is swimming pool that has clear water without using chemicals. These pools rely entirely on the plants and animals to condition the water. This is so effective that this pool has been tested and shown to be of drinking water quality. Also, through the continual natural cleaning process the pool water never needs changing, saving water. Chemical free so it is healthy for people and wildlife. Wild Swimming at home."