Glad you asked...
The foley catheter is attached to a bag that should only been emptied when it is full. You probably need to empty it about every eight hours. For more information, see this website: http://www.drugs.com/cg/how-to-care-for-...
Then again, this answer might help you...
Usually you are taught proper care and maintenance of a foley catheter before being sent home, or a care taker will do this for you. Your foley catheter will be flushed, or irrigated with a syringe of saline.

