RO
 

When someone posts on the board that they are having algae or toxicity problems with their reef, the first question is : Do you use RO or what?
Several reefs in my area have suffered mysterious "toxins" , one person thought it might be the copper fittings on the Superstore water dispenser, but most remain unsolved and the reefs either died or were rebuilt.
RO water is just one other barrier to accumulating unknown substances in your tank thus helping with extending the lifespan of your reef before the dreaded "old tank syndrome" and gives you uniform quality water . I like it for the peace of mind...and for $100 bucks why risk it?
my 2 cents

Um, you know sodium is a metal, right? I'm thinking K is also a metal. Many "ides" and "ates" are salts of metals. Just clearing things up a bit :razz:

Re: Hey DuDe . . .
 

This is also risky because sometimes grocery stores can neglect changing their RO filter cartridges before they are shot, therefore you may as well be adding tapwater to your tank.