the murmurings of trees in the wind
In traveling homeward, buy forty good crones, and fat up the bodies of those seely bones
One of the three volumes Cyby had brought was as large as the top of a small table […] ; from the arms impressed upon its saffian cover, I supposed it to be the history of some old noble family.
Some filtering materials are used for special purposes rather than general use. One such material is greensand, sometimes referred to as manganese greensand. […] [M]anganese greensand is produced when greensand (the mineral glauconite, a natural zeolite) is treated with manganous sulfate followed by potassium permanganate. This process forms a manganese-coated greensand, which can remove soluble iron and manganese. When the removal capacity of the manganese greensand is exhausted, it can be restored by soaking the filter bed in potassium permanganate. In many water treatment plants, potassium permanganate is continuously fed into the influent water, so the manganese greensand can be continuously regenerated.
manganese greensand.
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