I have a Lansinoh pump, and have thought about buying replacement membranes (along with a few other things) for them. How long are you supposed to let them go? It's hard to know if I'm noticing a change in the pumps abilities or if my supply has changed since the beginning (which I am sure it has), etc. Thanks!
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Re: How often do you replace pump parts?
I have a Lansinoh, too. I pump 3x a day at work 5 days a week. I replace the membranes and valves every 6 weeks, and I do feel a difference when I switch to the new ones.
By the way, Ameda Purely Yours and Lansinoh pumps are the same. I order replacement Ameda parts online from A Mother's Boutique.