How to build your own Natural Swimming Pool. A swimming pool that has clear water without using chemicals. These pools rely entirely on the plants and animals to condition the water. Healthy for people and wildlife. Wild Swimming at home. David Pagan Butler has made films for the BBC on Natural Swiimming Pools. He builds them himself to show you how to make a pool for a fraction of the cost of a commerical installation. Featured in the current (Winter 2010) Permaculture Magazine.