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Old Yesterday, 12:15 AM   #1
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How to flush the black tank

I just bought a 2401R MBS and I am a bit confused regarding the procedure for flushing the black water tank. On the side of the RV next to the black tank flush hose connection there is a sticker that says "Do not use the tank flush valves unless the fullway termination valve is in the open position. Can result in unsanitary condition..."


What is a tank flush valve and where are they located?
What is the fullway termination valve and how do I insure that it is in the open position?


Can anyone give me easy to follow step by step instructions for flushing my new black tank? Do you also recommend flushing the tank with a wand from the toilet? Thanks in advance from this dump station newbie.
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Old Yesterday, 06:15 AM   #2
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Tank flush is a sprayer that does a so-so job of rinsing residual debris from your black tank. Recommended procedure is to open black tank valve, then hook up hose to flush hook up and run fresh water while black tank valve is open. Many, myself included, drain my black tank the, close the valve and then hook up the flusher and partially fill black tank, then when a build up of clean water is in the tank, open black valve so you get a water surge to clean out left over debris. Repeat as needed. Inherent risk here is that if you get distacted (easily done), you get a poo fountain coming out of your exhaust stack or toilet. Thousands of posts where this has happened. Wand works very well but a hassle and can get messy. I've used the rinser for years with the above method without a problem.
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Old Yesterday, 08:45 AM   #3
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T I've used the rinser for years with the above method without a problem.Rusty
x2, I've always used the onboard tank flusher for years without issue because I ALWAYS flush and rinse fully every time and I keep the black tank wet at all times. Once I flush fully, I add back a couple gallons of fresh water along with a packet of tank treatment so it sloshes around in the tank on the drive home and the tank is ready for the next trip. The issues with paper sticking to the sensor and throwing off your readings that you read about all the time, or the dreaded "pile of poo paper mache" is caused by folks not using enough water when they flush and not keeping the tank wet at all times. I also installed a tap into my sewer line at home so if the dump line is long, I dump and rinse when I get home.

I considered buying a flush king (the outside tank flush assist) but so far have not made the leap. I would not want a wand to use inside when there are good options for using it outside.

And lastly, there is a lot of information on the internet to help you along with all of the nice people here!

P.S.: Don't forget to wear gloves when you dump your tanks!!!!
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Old Yesterday, 08:54 AM   #4
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And Iíve found that if my sensors are showing an incorrect tank level, even after extensive flushing, I throw an 8 lb bag of ice down the commode and as I drive home, the ice cleans off the sensors and the tank walls.
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Old Yesterday, 09:25 AM   #5
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Quote:
Originally Posted by RV-MO View Post
....
"Do not use the tank flush valves unless the fullway termination valve is in the open position. Can result in unsanitary condition..."

What is a tank flush valve and where are they located?
What is the fullway termination valve and how do I insure that it is in the open position?

....
1. "valves" is misleading since it's plural. There's not two.
2. "valves" is misleading because there's not even one! It's not a valve, it's a water inlet with threads where you screw on a hose.
3. "fullway termination valve" is misleading since normal people can it a "black tank dump valve".
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Old Yesterday, 09:57 AM   #6
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Originally Posted by Mr. Dan View Post
1. "valves" is misleading since it's plural. There's not two.
2. "valves" is misleading because there's not even one! It's not a valve, it's a water inlet with threads where you screw on a hose.
3. "fullway termination valve" is misleading since normal people can it a "black tank dump valve".

Don't you just love RV language? I think it's great! ROTFLMAO.
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Old Yesterday, 10:00 AM   #7
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Don't you just love RV language? I think it's great! ROTFLMAO.
This particular label "takes the cake" in my book. I don't think a single label should cause so many owners to ask "What does this mean?"
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Old Yesterday, 10:50 AM   #8
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My procedure -

1) dump black tank - close dump valve

2) run hose from dump station water hose outlet to black tank flush

3) turn on water to flush and fill black tank (yes, I have the dump valve closed)

4) let water run for a few minutes and dump black tank again

5) repeat this procedure 3-4 times if dump station is not busy

6) close black tank valve, TURN OFF WATER HOSE and dump gray tank

NEVER leave the site while water is running! Make this procedure your ONLY task until finished
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Old Yesterday, 05:24 PM   #9
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You guys forgot the most important piece. Be sure to connect your sewer hose to the trailer as well as the sewer inlet.
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Old Yesterday, 05:35 PM   #10
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You guys forgot the most important piece. Be sure to connect your sewer hose to the trailer as well as the sewer inlet.
If your dumb enough to pull a dump valve without hooking up the hoses first, RV'ing may not be for you...
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