I make my own R.O. water with a unit., It only makes about 4 gal. a day but that is more than I need. I like it for plants requiring pristine water such as Masd. and Dracula. However, the Catts. get tap water that has been swirling around in a 125 gal. horse trough full of goldfish. I have found that R.O. water along with the fertilizer I was using (Michigan State) was causing deformed/incomplete blossoms on the Catts. After switching to the 'fish' water with a hardness of 8.0 the results on the Catts. is striking.