Turn off circuit breaker

shut off cold water entering the tank using shutoff valve

connect hose to spout at bottom and run hose outside

turn a hot water faucet on somewhere in the house. This lets air into the tank

use screwdriver to open valve at hose connection

let drain. Could take awhile

to remove sediment turn cold water on for 20 seconds then off. Let drain. Repeat 2-3 times

close valve with screwdriver and disconnect hose

slowly turn cold water back on. Make sure hot water faucet is still open

let fill then turn breaker back on