According to my Winnebago manual, it is 1/4 cup bleach per 15 gallons of tank capacity. Fill the tank, pump through all plumbing, including the water heater. Let it sit 4 hours. Drain, and flush with water.If you double the amount of bleach, you can cut the sit time down to 1 hour.

Best be patient and do as recommended by manufacture says.

but its harder to get the bleach odor out.

Don't forget the fresh water hose either!

When draining, I like dumping part into the black tank, part in the grey tank, which helps on odor control.

I also fill a cooler and put the fresh hoses in there making sure to purge the air out to do the job properly. I think I use around a cup in my 40 gallon fresh tank and water heater. I just flush it good afterwards and never have any bleach smell!

A reminder for those who sanitize the water system.

Beartoo
Explorer
Mar 20, 2014
Best be patient and do as recommended by manufacture says.
Johno02
Explorer
Mar 20, 2014
but its harder to get the bleach odor out.
suprz
Explorer
Mar 20, 2014
Don't forget the fresh water hose either!
mlts22
Explorer
Mar 20, 2014
When draining, I like dumping part into the black tank, part in the grey tank, which helps on odor control.
dodge_guy
Explorer II
Mar 20, 2014
I also fill a cooler and put the fresh hoses in there making sure to purge the air out to do the job properly. I think I use around a cup in my 40 gallon fresh tank and water heater. I just flush it good afterwards and never have any bleach smell!
TurnThePage
Explorer
Mar 20, 2014
dodge guy wrote:
I also fill a cooler and put the fresh hoses in there making sure to purge the air out to do the job properly. I think I use around a cup in my 40 gallon fresh tank and water heater. I just flush it good afterwards and never have any bleach smell!
That's a cleaver way to take care of the hose! Think I'll use a 5 gallon bucket.
ol_Bombero-JC
Explorer
Mar 20, 2014
BillyW wrote:
dodge guy wrote:
I also fill a cooler and put the fresh hoses in there making sure to purge the air out to do the job properly. I think I use around a cup in my 40 gallon fresh tank and water heater. I just flush it good afterwards and never have any bleach smell!
That's a cleaver way to take care of the hose! Think I'll use a 5 gallon bucket.

Be careful around that cleaver!

......while getting the water heater in the 5 gallon bucket..;)

.
oilslick
Explorer
Mar 20, 2014
I use a measuring cup and pour the bleach into the fill hose then after sitting turn on the water to fill tank.
ksg5000
Explorer
Mar 20, 2014
I let the bleach mix sit overnight - no downside, doesn't cost anything, and no additional work.
Kit_Carson
Explorer
Mar 20, 2014
Is it necessary to completely fill the tank or can you just do half tank?