Hot Tub and Spa ionizers. Plus prices, pictures, details. Ionizers Copper and silver have been used for centuries to sanitize water.
Copper is a well know algaecide and silver is a powerful bactericide.
In the ancient Greek and Roman civilizations, the royalty used to drink from silver goblets and their water was stored in silver urns in order to purify their drinking water. As the pioneer settlers moved west across the American continent, they learned to insured safe drinking water by putting copper and silver coins in their barrels of water and milk. The first modern attempts to use metal ions as a means to sanitize water were made in the 1930's. Then, in the 1960's and early 1970's, NASA conducted a research program aimed at developing a small, lightweight water purifier that required minimal power and no human monitoring. This program produced an electrolytic silver ion generator, slightly larger than a pager and weighing only nine ounces.