METAL XTRACT™ eliminates copper, iron, manganese, cobalt, nickel and silver from pool and spa waters. It removes and eliminates stain-causing metals in swimming pools to non-staining levels. METAL XTRACT™ is the easy and non-toxic way to remove and eliminate metals from pools and spas. METAL XTRACT™ is the way to remove metals which stain pool surfaces, hardware, and turns swimming pool water green or brown.