Oh ok, I understand.. Usualy I just use tap water for my freshwater. Without failure I might add. However I thought since I have this niffty little device I might use it to benifit my little FW fishies as well. I already use a product to raise the KH so not too big of a deal. Today will be my first water change with the RO/DI. So I will be sure to take all the tests to see if its up to snuff
Thanks for the help everyone...