Translations:Water - Biosand Filter/80/en

Barring exceptional circumstances that would cause a leak in the concrete housing, there should be no reason to replace the filter. If it is correctly maintained and installed, a filter can last a lifetime and the sand does not need to be replaced. If the water used is particularly cloudy or visibly dirty, the owner of the filter will regularly use the spin and dump technique to get rid of the dirt. This method removes a small quantity of sand and, over time, the filter will need more filtration sand added.