Nikia from Atchison, Ks writes
The product label for the Crystal Blue Copper Sulfate does not state that it can be used in pools and says to avoid direct contact with humans. Since this is an off label usage, we suggest contacting Sanco Industries at 888-697-2626 to see if any harmful effects would come of you using it in this manor. Please let us know if you have any other questions.
Answer last updated on: 07/12/2013