yes
i connected a spare RO unit to my waste ( i thought the first RO had " had it " but it turned out the cloth partical prefilter had completely gone and nothing was getting though that , when i changed it, the unit was fine )
it worked fine till the RO died, i never did replace the 1 connected to the waste
i find the same results can be obtained from fitting a small tap to the waste pipe and having it 1/4 turned shut, this decreases the flow of the waste ( the only thing to remember is this is likely to reduce your RO membranes life and when you flush, open the tap )