[jws444]

Originally Posted by frostiex

I read from here even the ro/di units are not perfect....is this the case and if this article is right?

http://www.netpets.org/fish/referenc...f/diatoms.html

thanks...

Well, ro/di units are the best mass market water purifiers we have available to all us reefers. It does indeed make 99.9% pure water when well maintained. The article seemed a little harsh, but I bet you he's using a ro/di unit on his tanks too. There is such a thing as creating 100% pure water, but you'll have to ask the people in the nuclear reactor plants for it.