You should get about ( units vary) a ratio of about 1:4 or if you are lucky, 1:3
one gallon of ro water to 4 gals of waste.
You must have reversed one of the hoses. Here is a link to a schematic of the plumbing, it has solenoids in it that you could ignore, just follow the plumbing.
http://www.watergeneral.com/support/...struction2.pdf