| http://www.w3.org/ns/prov#value | - s dissolved iron to precipitate, taking the arsenic and other elements with it as it forms a new layer of solid mineral.The amount of oxygen added is controlled to stop the precipitate from developing too quickly and blocking the well???s pores, so the process can take six to 10 weeks depending on the location and the specific mineral content.Because of changes to farming methods in the last few d
|
