Mountain Beach, Gaschurn, Austria is probably the largest organic/natural pool in the world, if not the most exciting.
David Pagan Butler was invited to take a look and show how this pool works.
Without the use of chemical disinfectants this pool can accommodate over a thousand visitors a day.
The water quality is so high it is recommended by doctors.
Heinrich Sandrell, the former Burgermeister, was the powerhouse behind the project and the pool was constructed by Biotop, Austria.
It has two pools on different levels connected with a stream you can raft down.
An Alpine summertime water wonderland.
For information on Organic Pools and how to build you own – organicpools.co.uk, fb/organicpools