According to Gastrostomy feeding tube - pump - child: MedlinePlus Medical Encyclopedia When the feeding is done, your nurse may recommend that you add water to the bag and let the water flow through the feeding set to rinse it out. For a G-tube, clamp the tube and close the roller clamp before disconnecting the feeding set from the G-tube. For a button, close the clamp on the feeding set, disconnect the extension set from the button, and closet the flap on the button. The feeding bag should be changed every 24 hours. Food (formula) should not be left in the bag for more than 4 hours. So, only put 4 hours (or less) worth of food in the feeding bag at a time. All of the equipment can be cleaned with warm, soapy water and hung to dry.