many applications, sry but no comparison, the Lab grade purity retails for $288
https://www.fishersci.ca/shop/produc...cal-11/p-20514
Copper kills angel fish at 0.00001%,
http://www.advancedaquarist.com/2008/10/breeder
Zinc kills coral at 0.00001%
http://www.advancedaquarist.com/blog...s-in-your-reef
if u want to discuss, pls post in Discussion Forum
i highly recommend u read and FOLLOW the RULES:
http://www.canreef.com/vbulletin/sho...d.php?t=114843