That's a copper based product. You should read about it here: http://poolsolutions.com/gd/mineral-...es-a-scam.html and here: http://www.poolforum.com/pf2/showthr...-amp-More-quot
Here's an excerpt that is most important to me, since my kids swim in my pool:
Copper kills algae. But, copper kills bacteria . . . v-e-r-y _ s--l--o--w--l--y. And, for the most part, copper does not kill viruses at all. Since diseases are transmitted by both those slowly killed bacteria and those not-killed-at-all viruses, that's a problem.
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