RO problems....

[Viggen]

I use RO h20 for my little reef tank & for some reason the thing will not work.  It puts out waste h20 but non passes through the good tube for filtered stuff.

Any idea what causes that?

Should I just replace the 2 membranes or am I better off just buying a new one?   

[verper]

Pretty sure the RO membrane is clogged or worn out.  I think they are good for only so many gallons of water.  You can backflush the membrane and see if it will buy you some more time.  Replace or new is the same except for the housing if it is a standard Dow or Filmtec membrane.

Why do you have two?