Sorel cementitious composition which time releases permanganate ion

A method of controlling the release of permanganate ion in an aqueous media, the method comprising:

• mixing a hydrated Sorel cement permanganate product into an aqueous media,
• the Sorel cement permanganate product having a Sorel cement outer layer substantially free of water soluble permanganate salt and a core comprising Sorel cement and water soluble per-manganate salt, the product comprising from about 10 to about 70 weight percent Sorel cement and from about 30 to about 90 weight percent water soluble permanganate salt.

A method of making a Sorel cement product comprising:

• a mixing Sorel cement, water soluble permanganate salt and water to form a moldable mixture, the moldable mixture comprising from about 5 to about 35 unhydrated Sorel cement, from about 30 to about 90 weight percent water soluble permanganate salt and from about 5 to about 35 weight percent water, which becomes part of the Sorel percent upon curing the cement;
• and
• curing the cement in molds which provides a hydrated cement product which includes the water soluble permanganate salt.