Quote:
Originally Posted by jeff64
I have removed clogs on a 5ver with the goofy drain pipe with a Flush King. You may be able to push your clog the opposite direction. You tell quite easily when the pressure is building in the system and release the gate valve and reapply the water pressure multiple times if necessary. They work
Flush King RV Holding Tank Flush Valve - YouTube
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If the tank vent pipe is clear pressure won't build other than the weight of the water you've put into the tank and if you run the water long enough the contents of the holding tank will start to run off the roof.
If the pipe from toilet to tank is blocked the best solution is to use a toilet snake which can cost as little as $5 at Walmart. These will clean the first 3' of pipe out which may well be enough.
Once you can get a little to flow out of the toilet bowl, mix up a bucket of warm water and some dish soap. Pour it into the bowl and keep repeating until a bucket or two have been poured into the tank. The soapy solution will often speed the dissolving process of the solids that have piled up at the bottom of the pipe. Drain tank once the toilet starts to flush better, close valve, and repeat. Tank chemicals will work too but Dawn dish soap also does a great job for a lot less money.
This process is a lot easier if you can take the unit for a drive with a partially filled tank with soap or tank chemical in it. Drive down the road and step on the brakes regularly to get the tank sloshing. Next time you drain the tank "stuff" from a couple years ago will come out.
For those new to the holding tank world, if you go to empty a full holding tank (as indicated by the gauge) and it doesn't seem like it took long enough to empty, you may have a solid layer of poo built up on the bottom of the tank. Keep the valve closed while in a campsite, opening only to empty when full. Always travel with SOME water in the black tank (doesn't hurt to have some in the gray tank too with some freshening chemical) so the normal sloshing while driving keeps everything from settling into a hard layer.
BTW, I earned my "Merit Badge" with a toilet like this in a MH I rented about 20 years ago. A Class C that had the "Throne" mounted over the back of a wheel well and a pipe running back to the tank with a couple 45's and 90's. I ended up clearing the clog with a couple coat hangers spliced together, half a bottle of dish soap, and several gallons of water. Apparently the rental company's lot persons thought it was just fine to hook up hose, pull valve, then go have a cigarette or two while the tank drained. Never bothered to flush with water during the process.
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