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Old 12-30-2016, 09:06 AM   #1
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Grey water tank

How would I flush out my grey water tank
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Old 12-30-2016, 09:22 AM   #2
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Old 12-30-2016, 09:24 AM   #3
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Grey water tanks don't normally need flushing! You shouldn't be putting anything down the sink or shower that would build up and clog the drain!

Some folks do put some kind of chemical in the grey tank because of odors, but not clogs.

Good luck, happy trails, and God bless!
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Old 12-30-2016, 09:40 AM   #4
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I flush out my grey tank a couple of times per year.
I do this to maintain the sensors working properly and also
to get rid of soap scum.

I mix up up hot water and Calgon (approx. 5 gallons),
dump it into the grey tank and let it sit for a few hours.
I then add i cup of dry laundry detergent and fill the tank to at least
half full. We leave for our next destination allowing the tank to get a good
sloshing. Drain the tank and all is good.

I use the same method for the black tank.

Have not had a sensor problem, or tank problem for years.

(touch wood)
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Old 12-30-2016, 10:04 AM   #5
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+2 to adding water and calgon to grey tank.
DaveB, Raleigh, NC
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Old 12-30-2016, 10:24 AM   #6
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+3 on Calgon. Been doing it for years. Cleans the scum of the sensors.
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Old 12-31-2016, 08:43 AM   #7
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Plenty of reasonably fresh water. Add some detergent if you feel like it, but it's never gonna be "clean" (and doesn't need to be). If your rig lacks a gray tank flush port, just run water down the sink or shower drains until the tank gets near full, then dump the tank.
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Home is in the Ocala Nat'l Forest near Ocala, FL
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Old 01-01-2017, 07:11 PM   #8
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Some of the black tank drops/cleaners (oxi chem) recommend putting some of the powder in your gray tank. That has been working well for us getting rid of odor if any.

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Old 01-02-2017, 12:58 PM   #9
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Originally Posted by ScottyBye View Post
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Old 01-06-2017, 10:07 PM   #10
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Had bad smell on the road ,the Calgon or cheaper the arm and hammer brand rain drops worked wonders for us from Amazon,use in both tanks now and no more horrible smell from gray tank, I did replace all sink vents also.
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tank, water

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