Changes

However, implementation of large and centralised drinking water treatments in developing countries is highly unlikely due to investments, civil construction, maintenance of infrastructures and availability of chemicals that are required. As a consequence, people in many developing countries are forced to consume water directly from natural sources or apply household water treatments as chlorination, solar disinfection or boiling, that have low cost but variable effectiveness.

==Acknowledgements==

* J.M. Arnalà , B. Garcia-Fayos, G. Verdu, J. Lora. [http://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=web&cd=7&ved=0CHcQFjAG&url=http%3A%2F%2Fwww.desline.com%2Farticoli%2F10560.pdf&ei=c5W1T8niOYigiAKU-t33Bg&usg=AFQjCNGmnmVfvj7uDFea7mdbzxWgssH3IA&sig2=gzJRkqbTVhlAT6e8xZUzEA Ultrafiltration as an alternative membrane technology to obtain safe drinking water from surface water: 10 years of experience on the scope of the AQUAPOT project.] Polytechnic University of Valencia, Chemical and Nuclear Engineering Department, Camino de Vera s/n 46022 Valencia, Spain. May 2008.