Hi Elisa, I had a Mom who boiled her Starter SNS for 20 minutes every day for a whole month. It looked yellowed but it still was intact and worked fine. I recommend boiling pump equipment 20 minutes once a day because that's what the Medela instruction book states and I figure I'm covered that way. I recommend continuing until baby is 4 months because that's what the Canadian Pediatric Society recommends. I figure I always have to cover my back with something in writing somewhere! -- ******Joan M. Fisher, RN, BN, MEd, IBCLC****** ***********Ottawa, Ontario, Canada************ [log in to unmask]