ararnd theorldld, childre die a resulof arrhoea-lalateillnesse every ur.a lack oclean water is a problem in argentina, too. >> the families who live here are among the poorest in rio de la plata. there's not even running water in the wooden huts they built themselves. this woman is explaining to nicolas wertheimer that she gets water from a pump and a hose that extends through the reeds. the water comes from the rio de la plata, but it's polluted, and poses a health risk. nicolas wertheimer wants to improve the situation, and founded the project "agua segura" to ensure the local water supply is clean and safe. local children are often sick from drinking contaminated water. their mothers have no one to turn to for help. >> is diarrhea also a problem? >> yes, it is. my little one was throwing up, and was taken to hospital. >> did he get antibiotics? >> no, they didn't give him anything. >> to tackle the problem, nikolas wertheimer is installing a water filter that doesn't need electricity. >> this is a filter. families who drink water from the river can posi