^ Yep, that just means the flow will slow, it doesn't mean it damages the RO membrane.
Example...my 50 gph unit takes about 2 1/2 hours to fill a 5g jug if I use straight cold water. If I use luke-warm water (prob around 75-80 degrees) it only takes about 1 1/2 hours to fill. BUT, I'm introducing a higher TDS to my RO membrane if I use warm water, so I'll save the RO membrane, and deal with the slow water flow.
