Water is essential for life
Dirty contaminated water, which is world wide phenomenon, is a threat to life
In many rural communities there is a shortage of water which may be contaminated.
The prime problem is bacteria and viruses, but also toxic elements e.g. arsenic.
Filtering the dirt and bacteria is the best method.
There are several other methods
1. Leaving a bottle full of the water in the sun to heat and sterilise the water
2. The Moringa tree seeds if crush contains polypeptides which adsorb bacteria and other contaminates and these settle and yield pure water. Michael Lea has a website showing how to do this. The Moringa tree is abundant in the tropics.
- Martin Eastwood