RO/ DI plumbing

[rynoe]

I just recieved my used Aqua FX 100gpd RO/DI unit. I was very pleased with the condition of the unit when I got it home however all the plumbing lines were disconnected from the RO housings. I have got the inlet into the cap figured out but at the outlet end which fitting is waste water and which is fltered water. The way i think it goes is waste water from the center plastic tube of the membrane and filtered side coming out of the media side of the membrane. Is this right or am I backwards?