Jack's Magic JMCOPPER10 No.2 Copper Scale Stuff Stain Cleaner Solution This stain cleaner is designed to remove copper stains and scale safely and effectively from all types of pool surfaces without draining the pool. The copper and scale stuff is more effective than acid washing the pool and will save both time and money. Use 10-pounds per 10,000 gallons. Must bypass heater when using this solution. Features: Stain cleaner is designed to remove copper stains and scale Removes stain from all types of pool surfaces without draining the pool More effective than acid washing the pool