ohh, thats hillarious! ZOOOOMMMM!!!! lmbo.
When I refer to a holding tank, Im refering to some kind of resivor to store r/o water, like an old salt bucket or the like. What else do ya need? I dunno, whutchya got? Seriously, its not all that complicated once you understand the basic concept. And Ill be more than happy to help you thru the steps involved whenever youre ready. Maybe some other folks using a reactor in a similar fassion could chime in?