If you ever see in your house: All of the sudden yesterday, the pressure coming out of the faucet, specifically the hot water was really strong. Then all of a sudden you wake up one morning, and it's not working as well as it did. You notice it starts declining. What that can be an indication of a sediment. Maybe rust in the bottom of the tank or it could be the tank basically falling apart from within and coming out of the hot water faucet.
The only way to get ride of sediment, it's really telling you a couple of things. One it could be the tank's on its way out. Or two, this water that's rusty and debris is kicked up. Both of which could be remedied with a cleaning. However, sometimes replacing the tank is going to be the way to go.