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I have looked everywhere and can't find how often you are suppose to change your membranes on the PISA pumps.  It doesn't seem to be working as well as it use to and was wondering if that could be the problem.  I have only been using it a month.  TIA

I noticed that if you bend the membranes  even a little bit they tend to wear out faster. My pump came with an extra set. Replace them and see how it works afterwards. You can always buy more at your local Target or Babies R us store. Or even online here. You can get them just about anywhere.

I heard it depends on how often you use it, but a good rule of thumb is every 3 months or so

I have the same question.  How often are we suppose to change tubing & membranes?  My pump doesn't work as well anymore either.  I've only had my pump for about 1 1/2 months.