Which filter system do you use?
I actually have a similar product (upgraded) from a different vendor; air water icehttp://www.airwaterice.com/product/1TYPHOONIII/TYPHOON_III_AQUARIUM_RO_DI_75_or_100_GPD.html
The one I have is more expensive and more appropriate for reefkeeping. The one I posted above is $60 cheaper and PLENTY good enough for homebrewing. You're welcome to come over and check it out if you'd like.