Help keep your bath clean and healthy with the purifying qualities of pure copper. Chemical-free, all natural 4" diameter copper water purification disk is 99.9% pure American-made copper. It’s designed to sit up off the floor of the bath with 3 feet to ensure that the entire surface area of the disk is in contact with the bath water, maximizing its effect. The disk is made here in the USA with copper sourced from Revere Copper, Rome New York. Tarnished copper does not lose any of its beneficial qualities. Simply place in any bird bath for chemical-free water purification.