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Old 06-30-2009, 12:59 PM   #1
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1978 31' Sovereign
Mukwonago , Wisconsin
Join Date: Jun 2009
Posts: 5
Potable water tank nasty

Hello I an a classic car guy who is intending to restore a 1978 Airstream International. The tank has black slime in in from lack of use and I can not find a drain for it. Is there an easy way to clean or remove it. It is just inside the driver side wheelwell. This unit has a center bath. Thanks!!!!

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Old 06-30-2009, 02:12 PM   #2
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1999 23' Safari
Perrysburg , Ann Arbor
Join Date: Sep 2005
Posts: 914
Have never seen one without a drain on the fresh water tank somewhere. There are recognized ways to sanitize such a tank - search on the Forums for "sanitize" and you will find them. They involve adding ordinary household bleach to the partially-filled tank, then filling it all the way with fresh water, running this solution out of all taps, shower head, etc. for a bit using the coach's pump, then letting it sit for a pre-determined amount of time, then draining (you can always use the water pump to pump out the tank) and refilling. Most do this every year and sometimes more often.

Good luck - and welcome to the Forums.

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Old 07-01-2009, 08:41 AM   #3
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1978 31' Sovereign
Mukwonago , Wisconsin
Join Date: Jun 2009
Posts: 5
Tank sanitization

Thanks. I suppose the oxidizing action of the bleach will dissolve the slime???? I was hoping to flush it somehow... I will go drain hunting. Thanks again Jeepguy
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Old 07-01-2009, 10:10 AM   #4
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2006 30' Classic S/O
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Mohrsville , Pennsylvania
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It may be a good Idea to tow the trailer around while it is half full with the bleach solution. That way the sloshing of the water should help dislodge the ectoplasm that is inside your tank.
Carl, Elaine & Finn The Beagle
2006 30' Classic W Slide & Limited Package Katarina
2006 GMC 2500 HD 6.6 Turbo Diesel Crew Cab 8' Bed
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Old 07-01-2009, 11:51 AM   #5
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2008 16' Safari
Destrehan , Louisiana
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There is a drain for it. Look under the floor near the galley. You'll find a water pump there. Follow the lines back to the tank inlet. The drain is there. You can't see it from under the trailer.
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Old 07-21-2009, 09:57 AM   #6
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1978 31' Sovereign
Mukwonago , Wisconsin
Join Date: Jun 2009
Posts: 5
Thanks to all. Drain is actually a plug directly below fill inlet behind an access cover that has the winter drain down tube passing through it. I was looking for a valve assembly of some type. Got it now... Thanks!!!

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