General Boards > Technical Support
Tank flushing
Dennis Hackert:
question 2 of 100
As you will be able to figure out by my questions, that I have never owned and operated a motor home.
At the least I should give all a good laugh.
Sewer draining process? the book says to flush after every dump (emptying process) . What if you decide to empty at a reststop or truckstop where you have no shore water hook up, how do you rinse flush tanks? Is it wrong to hook up a hose from fresh water tank to rinse gray and black tanks? At present I do not see a place to hook up a hose from fresh on board water, I will have to install a hook up.
BTW , you will find this funny. My first flush from shore water, I had water pouring out above aqua hot system(passenger side) water coming from up on top in behind pantry. I was totally baffled. After reading on this forum found out about the vacuum breaker valve, but it was good, the plastic one way check valve next it was cracked. That was my first experience with this forum, this is so awesome, much gratitude to all you road warrior engineers. Thank You!
DH
Joel Ashley:
Keep a separate non-white (to discern it from potable water ones) hose to use just with your built-in flush system. A backflow attachment may be used at one end as extra protection of source systems. I stow my yellow hose in a bay separate from the water bay where the white potable hose is stored fastened end to end, hung from a bay ceiling hook.
https://www.amazon.com/Camco-RhinoFLEX-Black-Water-Clean/dp/B06XGW1NGD/ref=asc_df_B06XGW1NGD?mcid=f924b67af98e3540977d437f852adf5f&tag=hyprod-20&linkCode=df0&hvadid=693447639265&hvpos=&hvnetw=g&hvrand=9259679508358179417&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9032835&hvtargid=pla-433879943422&th=1
You don’t necessarily have to flush after every single dump, as at rest stop or govt. dumps with no rinse end fittings, but if time allows it helps keep the factory black tank sensor(s) from clogging failure. If an aftermarket external level-sensing system replaced the original in-tank one on your ‘06 via a previous owner, then flushing isn’t as critical. But it can keep grundge from getting hung up in the waste slide valve, and provide a relatively clean stored waste hose.
Just use a sink faucet and the water pump for gray rinse if in a pinch, and hold the toilet flush open to do the black tank. It adds a few gallons of clean water, then if no one’s waiting in line behind you, disconnect and drive back and forth 10 feet once to slosh it about before reconnecting for a final valve release. But that of course doesn’t well-rinse the black tank walls like a built-in San-E-Flush with multiple spray heads. It can help flow out to raise the curbside slightly with the air level system.
I don’t know of anyone that reroutes onboard water to connect to a San-T-Flush. The pressure might not be as effective as residential anyway.
Joel
Eric Maclean Co-Admin:
Dennis
As Joel stated it's not necessary to flush your black tank every time you dump .
But I have some tips to help you negotiate the tanks.
First most people don't use enough water in their toilets as a rule of thumb you should fill the bowl at least half full or above .don't worry about filling the black tank too fast as the grey always fills up first .
Second it's better to have your black tank at least half full before dumping the extra water helps carry the solids away.
Third never leave the black tank dump valve open this allows the liquids to drain away leaving the solids behind creating the dreaded poop pyramid in the tank.
Fourth always dump your black before your grey this way the gray water flushed out the dump hose so its clean/eric to put away.
Now for a trick that will answer your question.
When dumping at a dump station or rest stop dump your black first once it is done running out with the hose still connected lift the hose up about two feet off the ground close to the coach and then with the black valve still open now open the gray valve and allow the grey water to run back into the black tank for several seconds then close the grey water dump and lower the hose back down this allows you to use your grey water to flush the black tank do this two or three times and then finish up by dumping your remaining grey water to flush the hose out before puting it away.
This allows you to keep things clean until you can take your time to do a good flush ( best done with a full hookup) at an RV park.
If you encounter tank order there are several tank additives on the market but over the years Ive found that this recipe from the clean tank guys works as well as any
https://kleentank.com/tank-solution-recipe/
Hope this helps
Eric
Steve Huber:
Dennis,
While Eric's approach of elevating the dump hose and allowing gray tank water to enter the black tank is OK if you are careful and don't have access to shore water, I would not recommend it for general use. Your coach has a tank flush hookup. Use it each time you dump if possible. Turn it on and close the drain valve as you want to allow sufficient water in the tank to create a venturi action when you open the drain valve to help pull all possible debris out of the tank. I recommend a clear plastic fitting between the tank drain valve and the drain hose. That way you can repeatedly flush the tank until you see clear water coming from the tank. Water is critical to tank odor control. I would always add 2-3 gallons of water to the black tank after dumping. That and a capfull of Tank Tech kept my tanks odor free.
Steve
Eric Maclean Co-Admin:
Dennis
When using your tank flush with the black tank valve closed it is important to keep an eye on the tank level too often people have been distracted while doing this and allowed the black tank to over fill giving the water nowhere to go but up the vent stack causing a volcano of --------- on the roof.
As Steve mentioned you need to get at least a 1/4 tank or more to get that velocity of flow to carry away all the TP and other things that tend to stick to the sensors and the sides of the tank.
And as Steve pointed out it's a good idea to start your tank with several gallons of water so that the incoming solids from the toilet don't impact a dry tank bottom which allows then to stick .
Hope this helps
Eric
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