I can't speak for other makes, but my owner's manual calls it backwashing, but it does not reverse the flow, it is just being flushed. One thing that does happen in the beginning of a "backwash" is that most of the sugar is washed to your concentrate tank. I suspect that is where the misnomer backwashing originated. You are washing a high percentage of sugar back where you want it, where it can be made into syrup. By the way, my RO is a Deer Run by Ray Gingerich, a basic RO.
Dave Klish, I recently ordered a 2x6 wood fired evaporator from A&A Sheet Metal which I will be converting to oil fired
Now have solar, 2x6 finish pan, 5 bank 7x7 filter press, large water jacketed bottler, and tankless water heater.
Recently bought another Gingerich RO, this one was a 125, but a second membrane was added thus is a 250, like I had.
After running a 2x3, a 2x6, 3x8 tapping from 79 taps up to 1320 all woodfired, now I'm going to a 2x6 oil fired and a 200-425 taps.