The simplest way to get rid of rust sediment is to flush the pipes. Open three or four cold water taps in the house and let them run for about 20 minutes at top pressure. This should be long enough to clear the pipes of rust sediment, but if it isn't, wait about 30 minutes and then flush them again. Instead of opening faucets in the house, run the hose at full capacity for 20 minutes and use the water on landscape plants to clear the rust.