What you should know before buying a second-hand breast pump
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Open system pumps cannot be used safely by more than one person.
An open system breast pump is a pump that has no physical barrier between milk and pump motor. With these pumps, breastmilk can travel down the tubing into the pump motor. This can lead to mould growth both inside the pump casing (where you can't see it) and in the tubing. There's also a possible risk that bacteria and pathogens could travel back from the inside of the pump motor to your milk. This is why open system breast pumps are for one person use only. Even if you replace all the tubing, breastshields and bottles etc, you can't sterilise the inside of the breast pump.Closed system pumps can be used by more than one person, but you MUST replace the kit.
A closed system breast pump has a physical barrier between breastmilk and the pump motor, so there's no way for breastmilk to travel into an area that can't be cleaned and could pose a hygiene risk - if it has been used correctly and parts changed as needed. You can see how this works by looking at the Spectra backflow protector (the UFO looking piece that sits between breastshield and tubing). There's a silicone diaphragm in the backflow protector that completely blocks the tubing from breastmilk. All Spectra breast pumps are closed system. When buying a second hand pump, it can be common to find that parts were not replaced regularly, or shield kits were not used and assembled properly, and milk has found it's way into the pump casing which has resulted in mould and bacteria. Also pumps experience knocks and drops or were not stored well - so a second hand pump may not be really what you want. Tired mums can often forget to set up shield kits correctly, and pumps can be knocked around a fair bit... all something to keep in mind when buying a second hand pump.

Unless you have access to an autoclave, breast pump accessories like breastshields, valves etc can't be sterilised at home to a standard that ensures pathogen transmission is impossible, so you should still replace all of the accessories (tubing, backflow protector, breastshield, valves). These parts are pretty cheap and do need replacing periodically in any case.