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Old 03-20-2019, 12:58 PM   #1
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Chemical cleaners for holding tanks, 2003 Land Yacht

Hello,
I have a 2003 Class A Land Yacht, 26'. We bought it used with very low mileage and usage.
The grey water tank seems to be lined with organic material. After an initial rush of water it will drain slowly for what seems like forever.
Can I use a "Mr. Plumber" type cleaning product to help clean the inside of the tank? My online research has returned mixed opinions so I am now asking the experts.
Thank you for your help.
Bob
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Old 03-20-2019, 01:13 PM   #2
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Chemical cleaners for holding tanks, 2003 Land Yacht

Try a shot of Clorox or other chlorine bleach at about 1/2 cup per ten gallons capacity, fill the tank to near the top and let it soak for several hours. Could also drive around to slosh the solution around a bit. Then drain. Be careful not to splash on clothing. See if that helps.
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Old 03-22-2019, 12:29 PM   #3
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Chemical cleaners for holding tanks, 2003 Land Yacht

Rich,
Will do. We will be traveling a bit in April and I will apply your suggestion as we go.
Thank you for taking the time to reply.
Best regards,
Bob
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Old 03-22-2019, 12:35 PM   #4
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I would use a product called Bio-Clean. This stuff is expensive but works without damaging pvc pipes etc. We sold it at my plumbing company for $49 too. Maybe there are similar products for less, but I know this one works. Follow the instructions on the label. https://www.amazon.com/Bio-clean-Dra...gateway&sr=8-3
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Old 03-22-2019, 12:40 PM   #5
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A product like "Mr. Plumber" would likely be OK on the plastic parts of the system, but could adversely affect any rubber, such as the seals in the drain valves. I use an enzyme holding tank treatment, but if you have a calcified scale on the tank then you might have to use vinegar to dissolve it.
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Old 03-22-2019, 12:52 PM   #6
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Quote:
Originally Posted by Adventure.AS View Post
I use an enzyme holding tank treatment, but if you have a calcified scale on the tank then you might have to use vinegar to dissolve it.
Same kind of stuff as Bioclean "enzyme". Quote from Bioclean site:

"Bio-Clean is a special combination of natural bacteria and enzymes formulated specifically to digest dead organic waste found in your plumbing system. Bio-Clean will remove the grease, hair, soap scum, food particles, paper and cotton that are plugging your drain lines.

Bio-Clean will not digest or have any effect on inorganic materials such as plastic pipe. Bio-Clean will not produce heat, fumes or boiling like dangerous chemicals do.

Bio-Clean is completely safe for people, plumbing systems, septic tanks and the environment."
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Old 03-22-2019, 01:35 PM   #7
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A heavy dose of tri sodium phosphate allowed to soak for several days will soften the mess. Slosh by driving a while, then dump.

Lather rinse repeat and you'll be good as new!
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Old 03-22-2019, 01:43 PM   #8
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The grey tanks in my Airstreams had the valve on the side of tank. As the tank emptied the flow would decrease. When almost empty be the flow would be very slow. This is normal.
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Old 03-22-2019, 02:46 PM   #9
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Quote:
Originally Posted by AtomicNo13 View Post
A heavy dose of tri sodium phosphate allowed to soak for several days will soften the mess. Slosh by driving a while, then dump.

Lather rinse repeat and you'll be good as new!
I too have had good luck with TSP. Another thing I have had success with was powered dish washer detergent (Cascade, etc), which is less harsh than TSP.
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Old 03-22-2019, 03:18 PM   #10
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Tank Cleaner

This is what I used to clean my tanks:

EXTREME CLEANER by Happy Campers - RV & Marine Extreme Tank & Sensor Cleaner

It worked like a charm. It was, just as aside, recommended by the tank indicator manufacturer: Garnet.
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Old 03-27-2019, 11:38 AM   #11
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Originally Posted by RACuthbert View Post
Hello,
I have a 2003 Class A Land Yacht, 26'. We bought it used with very low mileage and usage.
The grey water tank seems to be lined with organic material. After an initial rush of water it will drain slowly for what seems like forever.
Can I use a "Mr. Plumber" type cleaning product to help clean the inside of the tank? My online research has returned mixed opinions so I am now asking the experts.
Thank you for your help.
Bob

Thank you to all of the replies.
I will work my way through the options provided with
absolute confidence my problem will be solved in short
order.
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