Breastfeeding and Breastpumpinghttp://www.medelabreastfeedingus.com/forums/15.aspxAbout all things breastfeeding and expressing breastmilkenCommunityServer 2007.1 SP2 (Build: 31113.47)Re: replacing partshttp://www.medelabreastfeedingus.com/forums/thread/3096.aspxFri, 03 Jul 2009 12:46:14 GMTa3cad0db-79cd-4fbb-918f-5e54bdbae2d2:3096teach8190http://www.medelabreastfeedingus.com/forums/thread/3096.aspxhttp://www.medelabreastfeedingus.com/forums/commentrss.aspx?SectionID=15&PostID=3096Someone told me to replace the membranes every 3 months.Re: replacing partshttp://www.medelabreastfeedingus.com/forums/thread/3090.aspxWed, 01 Jul 2009 17:10:03 GMTa3cad0db-79cd-4fbb-918f-5e54bdbae2d2:3090michele360http://www.medelabreastfeedingus.com/forums/thread/3090.aspxhttp://www.medelabreastfeedingus.com/forums/commentrss.aspx?SectionID=15&PostID=3090I don&#39;t know for sure how often you are supposed to replace them, but I have only replaced them when they were torn or the couple of occasions where I accidentally dropped one down the sink drain or lost one.replacing partshttp://www.medelabreastfeedingus.com/forums/thread/3060.aspxTue, 23 Jun 2009 11:38:23 GMTa3cad0db-79cd-4fbb-918f-5e54bdbae2d2:3060msatude0http://www.medelabreastfeedingus.com/forums/thread/3060.aspxhttp://www.medelabreastfeedingus.com/forums/commentrss.aspx?SectionID=15&PostID=3060<p></p> How often do you replace the membranes for the PISA? I have been exclusively pumping for 8 weeks now and it seems like I am not pumping as well...