I run two of these below for a RODI storage system. I have one in the laundry room on the first floor where the RODI unit is and one in the Fish room on the second floor. I run a Mag 18 to pump the water from one tank to the other. My back just couldn't carry water up the steps any longer.
55Gal square flat bottom.
http://www.plastic-mart.com/class.php?item=913
Here is my mobile water change station. Two 10gal. Vittles Vaults on a ghetto Harbor Freight cart. Heaters and power heads. One new water container and one waste water. once I pump the waste out I pump the new in then roll it to the closest bathroom and empty it.
I want to do a system like Los's but at the moment and the current location of the tank it is not feasible. My next tank will be against the wall that backs up to the guest bedroom closet and it will be my sump/water station area.
Kc3