I just run 3 membranes because of the savings in time when filling containers and the water savings. I’ve ran 2 membranes for a few years but I just added the third membrane relatively recently. I think I may start a new thread on this topic to get other peoples input without wasting more space on your help thread, since I don’t have an issue with this that I know of.curious why do you feel you need to run 3 membranes?
It is something to think about and if I ever start having unusual tank issues I will look into it more.