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Old 01-03-2014, 07:39 AM   #15
Rivet Master
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2012 30' Flying Cloud
San Antonio , Texas
Join Date: Jul 2012
Posts: 592
Was suggesting vinegar since it was recomended for, and I used it regularly, to clean lime from the raw water side if marine engine heat exchangers. With vinegar, you are sure to do no harm to rubber parts. It did take much longer as it is a much weaker acid. Thanks for the list, have not seen that in the manual.

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Old 03-26-2014, 09:48 PM   #16
Road Geezer
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2011 27' FB Flying Cloud
San Jose , California
Join Date: Jan 2011
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How much 10% HCL solution to use

I have a blackwater valve that appears not to close completely. The handle shaft sticks out about 1/2" farther than the Aux Tank shaft, so I think it's not seating completely. This started about six months ago. Also, when I remove the drain cap, there is always some flow of residual black water. Luckily, I wear gloves.

Reading the posts above, I want to try a dilute solution of hydrochloric acid; I use it in our backyard pool and have lots on hand and know how to handle the stuff. I have two questions:

1. How much 10% dilute solution should I make up? My blackwater tank has 37 gallon capacity and I want to make sure that the entire valve surface is covered.

2. Do I need to just expose the tank side of the valve, or should both sides be treated?

If both sides need treatment, I'm assuming that the outside drain cap--the one I remove to attach a drain hose--will prevent the solution from draining out while treating if I open the valve just a bit to allow the solution to fill the section behind the cap.

Thanks for your suggestions and help,


As far as I know, this is the oldest I've ever been.
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Old 03-27-2014, 01:51 AM   #17
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Paul, my post #6 above details the quantities and procedure I used. Cleaning both sides would be worth a try. I would leave the exterior cap on, open the valve a little way for a few seconds to flood that area, then close the valve. I closed the grey tank valve before starting the treatment as I wished to concentrate the acid in the black tank valve area.

Nick Crowhurst, Excella 25 1988, Dodge Ram 2500 Cummins Diesel. England in summer, USA in winter.
"The price of freedom is eternal maintenance."
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