Thanks Rob! I was starting to get very confused there

. One more question....on the page for the Aquatec 6800 it mentions using some kind of pressure switch valve or electronic shut off valve....will I need to get one of these as well?
Here is one the same guy has in his store
eBay: REVERSE OSMOSIS DI Aquatec Tank pressure switch 19.99 (item 250056683691 end time Apr-01-07 09:35:54 PDT)