I have read through lots of of texts on the net about alginates and sodium alginate, and can conclude that all alginates are not easily degradable in the body. A complete degradation of alginates requires the enzyme alginase, which all mammals lack. Some degradation occurs in water, which makes it useful for slowly releasing drug within the body.
So I think that alginates (sodium alginate) then is best to make gel of high concentrated reduced colloidal silver for the use on wounds, and not as the best choice as capping agent for drinking, unless