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BULLETIN 23

CHLORINATION PROCEDURE

The chlorination procedure is used to eliminate various bacteria that accumulate and grow 
in water heaters. These bacteria often cause odorous or discolored water conditions.

Please read the steps of the chlorination procedure prior to beginning. If you feel 
uncomfortable performing any of these steps, contact a service person to perform this 
procedure for you.

Turn off the gas or electric supply to the tank.

Turn off the cold water supply valve to the tank.

Open a nearby hot water faucet to relieve the vacuum.

Drain all the water from the tank (a water-hose may be needed).

Remove the anode rod(s), and close the drain valve.

Using a funnel in the anode opening add one gallon of household chlorine bleach for every 
25 gallons of tank capacity.

Reinstall anode rod(s) after inspecting and replacing as needed.

Open cold water supply valve and refi ll the system. Then draw the water to every hot 
water fi xture, until the smell of chlorine is detected. Operate dish and clothes washers until 
a noticeable amount of the chlorine is detected as well. All hot water lines must receive 
treatment.

Leave the chlorine solution undisturbed for one hour or more.

After the contact time has elapsed, drain the tank according to steps #2, #3, & #4.

Close the drain valve and refi ll the tank. Allow the tank to sit for 15 minutes. Repeat steps 
#2, #3, and #4. Continue to fl ush the tank if the water is discolored or contains a chlorine 
odor.

Close the drain valve and refi ll the tank. Flush all chlorine from the piping by opening every 
hot water outlet/ appliance.

Return hot water heating system to service by following the recommended start-up 
procedure posted on the unit or in the manual.