Reading natural pool I started reading the book ‘How to build a natural swimming pool’ and after a few lines already I was driven back to my childhood and lovely memories cam floating to the surface. When I was a child, I swam in natural swimming pools and not like now a days, the modern swimming paradises. The requirements are: - the water should be visually clear - free from undesirable weeds - free from pathogenic germs extra 1, sense of sight - surrounded by lush, healthy vegetation extra 2 household - toilet, shower, cleaning - consumption.