Search on ebay, you can get a new unit for less than $150 that will produce 100GPD and it's 6 stages. I recently sold mine for $75 , no longer have the use for it.
-Kris
thanks for all the responses. i will probably get the ebay one. i've heard that i should actually get one that is rated for 75 gpd. nanareefer, did you get alot of waste water when you used it? what do you think was your clean to waste ratio?