1-4 KGS = 380 per kilo 5-9 KGS= 375 per kilo 10-19 KGS =370 per kilo Copper sulfate, otherwise known as bluestone, is sometimes used in swimming pools as an algaecide. The American Journal of Public Health recommends using copper sulfate in swimming pools only as a method to control growth of algae; therefore it should not be used as part of your regular pool chemical treatment. By properly assessing the swimming pool's alkalinity, you can add the appropriate amount of copper sulfate to a swimming pool to control algae growth.