Love to swim but hate the chlorine? Then this should be the best answer for your problem.
A Natural Swimming Pool is a 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. It’s chemical free so it is healthy for people and wildlife alike. It’s truly wild Swimming at home.
Here are some free plans to build your own.
via:www.motherearthnews.com