PIS question

[Rose-Roget]

Anyone know why every once in a while, milk is sucked into the tube of my Medela PIS, rather than going into the bottle? I can do everything as normal and suddenly there will be slurping sounds with a lot of milk moving through the tube. I've caught it before going into the motor so far, but it certainly disrupts the pumping session.

[mom2tig99Nroo03]

happens pretty freqently to me, with any of the medela pumps that use tubing (swing, pis, lactina) it can be from a real fast letdown combined with cycling not letting the milk drain [roperly or it could be a problem with the white membrane sticking somehow. i've had both happen, though the membrane onl once.

[lunarlady]

I had this happen a couple of times when the membraes were not properly seated, needed replacement, or when the bottle was too full. I replaced the membranes about every 3-4 months. (I ran them through the dishwasher almost daily.) They are really cheep and you can get them at Target or BRU. Might be worth a try since cleaning and steam sterelizing the tubing is a PITA!