Water – Flushed water heater yesterday got a lot of sputtering right after that and today hot water is not flowing with the same pressure as before

Yesterday I decided to flush my water heater and I did the following:

1. turn to pilot
2. turn off cold water supply to water heater
3. open valve and drain hot water. I noticed it was still flushing for a while and I was expecting the water to be less and less every time so what I did is to turn off the water coming to the house and kept draining, and then now I noticed that the water flow was every time less and less, until it was almost no flow at all. I then closed the water heater valve.
4. I lower the temperature of the water heater since it's already hot outside, and I was thinking in moving it back up when is winter again.
5. I opened the water valve for the house, opened cold water valve to the water heater.

When I went upstairs and I opened my faucet with hot water I first noticed it was sputtering and brown water coming out and then the presure on the water wasn't the same as before. The next day the sputtering stopped but the pressure in some of the faucets for hot water is still not the same. At the beginning when I open the faucet it had good pressure and after 2 seconds the pressure decreased and it has been like that since then.

Note: I just checked and there are at least 5 faucets that have the same problem, not just one like I originally thought.

What could be wrong with my system?

Thank you