I've kept some in a pot. They do grow fast so I had to trim the roots every spring or fall. Worst case scenerio is to root a few stems if it gets to much to handle and get rid of the larger plant. Some of the ROS here are 15-20 years old and don't have that size. They are large though and have about 6in stems. It has been pruned back every year though.

I think you can get some info from your water company. If you mix your own fertilizers you can compensate for the minerals that are present in various amounts. I just bought an RO system and I haven't used it yet but I can't wait. I was looking for the highest quality ones which were very expensive. I started looking through a very well known internet auction site(I don't know if I can say their name but the name has four letters). Anyway I found nicer quality/more expensive ones. One day I was searching and I found some that were cheaper because a company will start some at a cheap price and let people bid away. I got lucky and got a new six stage RO system with deionizer for $50 with shipping. I say just keep looking on this auction site and be patient because it could take a month or two but you can find a good price. I hope this helps.

Personally I'd use Carbon filter and not RO only if because it's cheaper and works as well and uses less water. RO is , to me, a scientific curiosity, that's only useful to the groups that need absolutely the best quality water for lab work. And I'm a chemist who's run labs. Carbon filters particles down to 0.5 microns and filters any chlorine and VOCs . Replacements are $6 for every 2,000 or more gallons. In fact there's no reason carbon filter can't do your sink and refrigerator with the same unit. RO filters hard water but hard water isn't a real problem for drinks IMHO. Hard water can be a source of quality flavor. When you don't have hard water RO does nothing that carbon filter doesn't do. (was that a double negative..) And RO wastes water. For every gallon RO uses 4 to 10 gallons to flush away what it takes out ..even if it takes 'nothing' out. That's just the way it works. If I'm off base let me know. Just hate to see waste of cash or resources and hate to perpetuate ignorance about a type of technology. The good news is that RO will clean your toilet water into drinkable water.. so there's that option.. just kidding really sorry. IMHO no one uses RO who knows what RO is really used for.

No, I know the Aquasana isn't an RO system; I want the Rhino just to remove chlorine etc., for when my 7 year old takes extended baths and our showers, etc.; but I WAS interested in an RO, additionally, in the kitchen for our drinking and cooking water, to get rid of the 900 (slight exaggeration) contaminants and pollutants in our City of Chicago water.