membrane exhausted?

[Reef Pilot]

Originally Posted by Proteus

Just looked and it does its own backflush. I bought used so it could be three or so years old.
Also it made 400g a month for the first year I had it and 160g a month since. If I remember . Was told that making small amounts of water is harder on the membrane

Have heard that, too. Not sure if it is true. Here is my trouble shooting guide. Maybe it will give you some ideas on yours. My membrane is probably 6 years old, and still good. I bought the unit used 3 years ago, and the guy said it was 3 years old. So this one certainly lasts a long time.
http://www.airwaterice.com/category/z.91/