Good Sam Club Open Roads Forum: Travel Trailers: Holding Tanks
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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > Holding Tanks

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MarkTwain

Northern, Ca. , USA

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Joined: 07/26/2002

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Posted: 02/22/19 10:34am Link  |  Quote  |  Print  |  Notify Moderator

MarkTwain wrote:

oil8390 wrote:

a question regarding the holding tanks.
I have a 25 gallon black tank, how much water should i add to it before i use it for the first time in our new trailer and whats the easiest way to do that?


3 to 4 gallons. Empty your black only when it is almost full.
When you see/hear a gurgling and a bubbling sound, it is time to empty. If you have a back flush connection on the side, hook it up before you start emptying your black tank and leave it run until the tank is empty. Then close the black valve and let the black tank fill about 1/2 way, then open the black tank valve until the tank is empty again, this will wash down the inside of the tank. Close the valve and put in about 3 gal. of water. Job done


Unfortunatly, your gauges are as about as accurate as a crystal ball to tell your Future[emoticon] Trailer gauges for your black and gray tanks are useless!!!

6.2Superduty

ofallon mo

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Joined: 04/15/2018

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Posted: 02/22/19 01:56pm Link  |  Quote  |  Print  |  Notify Moderator

I put about 3 gallons of water in the tank when leaving home. It will slosh around the tank on the way to the campground.

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