And do the math.... it takes a LOT of RODI
water to impact most people's bills. Look up the cost per gallon, figure out how much you will make, multiply by 5 (rough estimate inclusive of waste) and I bet it's pennies to a couple dollars a month.
media and filters can get expensive. Be sure you are getting at least the amount of waste flow you expect, be sure to flush occasionally (if yours is set up for it), be sure to keep the membrane wet when stored, and keep the prefilters in good shape.
And find out if your water has chloramines (ask your water company), and if so read up on how to cope with it and RODI
filters -- it can quickly mess up your membranes and DI
media with inadequate prefilter.