Using a combination of traditional water filtration methods, as well as generating purifying ozone via a solar source, water from just about any source can be turned into potable water for use in cleaning, cooking and drinking.
In Africa, especially, there are more than 350 million people, and over 750 million people around the world, with no access to clean water. Additionally, over 840 000 people die each year from water borne infections and disease.
This is, of course, highly preventable, but as water purification set ups are generally very expensive, and require large amounts of electricity to operate, I have decided to go a little lower tech, whilst still providing the highest quality water possible.
There should be very few moving parts, or complex electronics, to ensure that the units can be easily maintained by the community itself.
There are some very amazing things that you can check here on the wet wash house cleaning service where they have added the similar ideas in their project.
I have been experimenting with Ozone as well as UV light, after using a filtration system and then the activated charcoal filter method as on the biosand site that you posted. Ozone is good, but not great for potential accidents/leakages. Will look more into the UV systems though too.
Good thing about an ozone generator, is that you can make one in about 15 minutes... UV II suspect would take longer, and getting replacement lamps into the field may be problematic.
There are some very amazing things that you can check here on the wet wash house cleaning service where they have added the similar ideas in their project.