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Old 09-22-2015, 02:46 PM   #1
Junior Member
Join Date: Mar 2014
Posts: 23
Black Water Tank Flush/Cleanout

Looking for the best method to flush/clean the black water tank. I'm assuming that you carefully take a garden hose inside and stick a rotating nozzle down through the toilet. I would like it "squeaky clean" before I shut down for the winter.

Also, does the fresh water tank have an easily accessible external drain?

Thanks for your help.

Dolphin Glenn
2000 Dolphin 5374
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Old 09-22-2015, 03:30 PM   #2
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National RV Owners Club
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Join Date: Jul 2015
Location: Conch Republic
Posts: 2,140
We don't have winter really but I do like to have the black tank good and clean once in a while. I tried those things that you attach to the bathroom sink and stick down the toilet but I haven't had a lot of success with them. Here in South FL we get sewer bugs if we don't get them clean enough. I tried a lot of things. I finally decided to try the GEO method.
I will admit that I had always considered this a form of Voodoo. It works! On the way home from the last trip of the season I use the geo mix. I fill the black tank half full and pour in the softener and the laundry detergent. When we get close to home I dump, fill and dump. Then put in a bit of water and some blue goo and things are fine.
There are a lot of other things in the article like using a clear pipe, Clorox and a lot of theorizing. I just use the softener and the detergent and it works. Easy too. First time in years I have seen my gauges work.
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