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How long to reach 10ppm-20ppm-100ppm concentration ?

Question asked by Brian Roberts on Oct 3, 2019

Question.>> I was reading about how early 

settlers and others in europe long ago would throw a few silver coins in there well`s to purify the water so could it be calculated that If a small amount of silver with approximate surface area of 1 square inch > 1x1-inch> of N4-.9999% OR N5-.99999% purity, was placed in a quart of highly *puerified water > usp/lab grade* > How long would it take to reach 10-ppm and 20-ppm consentration of silver ? Same thing for zink.