I am tire of wasting 200 gal of water to make 50 gal of ro/di. My input is 70 ppm from the Tds. So I was told to take out the first three stages and just use the di to eliminate the waste water. Is that correct? I could add a booster pump but how? I could upgrade to a new 1:1 from spectramax, are we doing any group buy from them this year?