I've been contemplating on getting a RO system for brewing water only. I brew 2 times a month so that would be the only time I would use the RO system. Looking at this system, http://www.ebay.com/itm/REPLACEMENT...921281?hash=item27df59af41:g:-CwAAOSw3v5YoOE~ The only change is the 2nd stage filter will be replaced with a 1 micron filter. Few questions: Will the filters be harmed in any way if water just sits for two weeks? Will mold begin to grow on the filters? This unit will initially be mounted in my garage where temps during the summer can get to 100+. Will these temps promote mold growth?