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Old 12-26-2015, 01:08 PM   #11
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Liquid calgon.....hard to find
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Old 12-26-2015, 01:22 PM   #12
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A “New/Old” Way to Clean the Black Water Tank

Best way to make sure the black water tank is completely clean (which most people don't realize, that just using the backwash valve does) is to connect a clear elbow between the end of the end valve and the slinky. Once this is done, and you have emptied the black water tank, I find, the best way to make sure the tank is completely clean (especially important when storing the RV for an extended period of time) is to dump about 6 or 10 toilet bowls full as this creates a gush of water and you can make sure all the solids are gone while looking at the clear elbow.

I like your idea, but I am concerned that you might get some backwash of black water into the grey tank before closing the grey tank valve.
I like the plumbers slippery soap idea (I'm not sure if Home Hardware here in Canada has that), but my concern with that is that it would hamper the effectiveness of the black water tank chemicals that breaks down the solids.

Joe O
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Old 12-26-2015, 01:58 PM   #13
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If you have grey and black drains through a single hose connection, look for a device tagged as "Flush King". It has a shutoff valve that will allow backfeeding of grey water into the black tank in order to help rinse the black tank, and it's made with clear plastic--so you can see how well you're getting the black tank cleared out. It is important to not feed black water to the grey tank, so you have to pay attention to which of three valves (black, grey and Flush King) you're opening and closing. Our trailer has a black tank flush, but the Flush King makes it easier to do a better job.
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Old 12-26-2015, 02:23 PM   #14
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Quote:
Originally Posted by bob caldwell View Post
Liquid calgon.....hard to find
Calgon normally comes in powder form, so you don't need to use liquid calgon, although I prefer it when I can find it.

Walmart sometimes has it.
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Old 12-26-2015, 02:25 PM   #15
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Here is a quick, simple and cheap way of cleaning your black water tank, much simpler than above. Your hardware store should carry a bottle of slippery soap used by plumbers to clean waste lines in houses. They tend to get coated on the inside walls and reduce the waste water flow over time. Simple put it's really slippery soap that you pour a cup into you toilet with your black water tank about half full. Now just before you leave on your next driving trip put in about 10lbs of ice cubes and let the fun begin on the road. It sloshes and cleans every thing. Just be sure to drain this solution when you get to your next stop. No need to rinse after draining because that slippery soap will remain in your tank for a couple of cycles which continues to keep it clean. I think it costs around $4.95 for a quart that lasts for a long time. Good luck and love simplicity solutions to problems.
Ice cubes don't do all that much, per this guys experiments:

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Old 12-26-2015, 02:26 PM   #16
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Powder form is a whole lot easier to find...
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Old 12-26-2015, 02:30 PM   #17
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Quote:
Originally Posted by Ray and Ann View Post
If you have grey and black drains through a single hose connection, look for a device tagged as "Flush King". It has a shutoff valve that will allow backfeeding of grey water into the black tank in order to help rinse the black tank, and it's made with clear plastic--so you can see how well you're getting the black tank cleared out. It is important to not feed black water to the grey tank, so you have to pay attention to which of three valves (black, grey and Flush King) you're opening and closing. Our trailer has a black tank flush, but the Flush King makes it easier to do a better job.
Quote:
Originally Posted by rockfordroo View Post
Ice cubes don't do all that much, per this guys experiments:

Neither does the Flush King. . .

https://youtu.be/dfTd0Slt_cU
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Old 12-26-2015, 03:58 PM   #18
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Quote:
Originally Posted by bob caldwell View Post
Liquid calgon.....hard to find
Walmart has had it in stock every time I look. My local grocery store started carrying it too. I buy 2 or 3 bottles at a time so I've got backup.
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Old 12-26-2015, 04:01 PM   #19
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Quote:
Originally Posted by Gilpalmer View Post
Here is a quick, simple and cheap way of cleaning your black water tank, much simpler than above. Your hardware store should carry a bottle of slippery soap used by plumbers to clean waste lines in houses. They tend to get coated on the inside walls and reduce the waste water flow over time. Simple put it's really slippery soap that you pour a cup into you toilet with your black water tank about half full. Now just before you leave on your next driving trip put in about 10lbs of ice cubes and let the fun begin on the road. It sloshes and cleans every thing. Just be sure to drain this solution when you get to your next stop. No need to rinse after draining because that slippery soap will remain in your tank for a couple of cycles which continues to keep it clean. I think it costs around $4.95 for a quart that lasts for a long time. Good luck and love simplicity solutions to problems.
I have been a plumber since 1982 and I have never heard of "slippery soap." Also, the ice cube method of cleaning/scrubbing the black tank has been proven to not work. The ice does nothing.

Bruce
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Old 12-26-2015, 04:02 PM   #20
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Guess I need to find a higher class Wal-mart
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