This chapter is divided into three parts: (1) historical accounts of water technology; (2) the science behind elemental purification materials (bone char, charcoal, clay, copper, and silver); and (3) an evaluation of the common household purification technologies.
Our protocol for the isolation of ART may form a commercial scale alternative as it is both economically attractive due to the small amounts of purification materials needed and also environmentally friendlier than the methods previously described.
Today, the evolutions of these offerings retain some elements of the prehispanic: versions made are within a circle of salt or lime "used for purification materials," divided into four parts that relate with the cardinal points and the four elements.
In addition to food aid, these families need blankets, plastic sheeting, and water purification materials.
Relief organizations like UNICEF have found it difficult to deliver essential supplies, such as medicines and water purification materials, to people in affected areas.
They provided water purification materials and hygiene kits to every household, along with shovels, hoes and wheel barrows to encourage the construction sanitary latrines.
