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09-08-2020, 03:00 PM
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#1
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Senior Member
Brand: Thor Motor Coach
Model: Thor Outlaw 38RE
State: West Virginia
Posts: 304
THOR #17154
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Flushing the tanks!
I've got flush inlets for both my black tanks. When I hook the water hose to the inlet, should I open the toilet valve while filling to flush?
I'm concerned that if the tanks are sealed, the pressure of the incoming water may damage the tank or some portion of the system (similar to making sure the overflow port on the FW tank isn't plugged when filling it).
Am I worrying unnecessarily?
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Charlie and my pup Hans
2017 Thor Outlaw 38RE
Maysville, West (by God) Virginia
Good Sam member
FMCA member
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09-08-2020, 03:11 PM
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#2
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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Don't worry: you've got a tank vent up on the roof!
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09-08-2020, 04:50 PM
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#3
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Senior Member
Brand: Thor Motor Coach
Model: challenger 37FH
State: Delaware
Posts: 695
THOR #13399
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But don't wait till water comes out roof vents to stop!!!
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09-08-2020, 06:32 PM
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#4
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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09-08-2020, 10:35 PM
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#5
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Senior Member
Brand: Thor Motor Coach
Model: Thor Outlaw 38RE
State: West Virginia
Posts: 304
THOR #17154
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Quote:
Originally Posted by wrapped
But don't wait till water comes out roof vents to stop!!!
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__________________
Charlie and my pup Hans
2017 Thor Outlaw 38RE
Maysville, West (by God) Virginia
Good Sam member
FMCA member
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09-08-2020, 10:43 PM
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#6
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I Think We're Lost!
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 22,195
THOR #8860
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I put a couple of ounces of dish soap down the toilet before firing up my San-T-Flush. I let it spray around in there and do it's thing until I've sprayed about ten gallons of water back in.
Then I "pull the ripcord, and watch the suds come out.
I repeat the rinsing until I see no suds, and the water looks clean.
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09-08-2020, 11:22 PM
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#7
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Senior Member
Brand: Thor Motor Coach
Model: Miramar 37.1
State: California
Posts: 2,494
THOR #12698
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I dump the black tank first. I then refill with the tank washers. I usually let it go until about 2/3's full then let it flow out. I also use some dish soap and flush it a couple of additional times until no more bubbles. It also helps to clean out the tank and sensors.
Paul
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09-08-2020, 11:29 PM
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#8
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 31S
State: Texas
Posts: 4,178
THOR #6411
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Never leave the hose bib when flushing. Black tanks fillip faster than you can imagine especially if a neighbor ask you what you are doing with the green hose. My flush uses 4 gallons per minute and my black tank is 24.5 gallons
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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09-20-2020, 08:30 PM
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#9
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Senior Member
Brand: Thor Motor Coach
Model: Thor Outlaw 38RE
State: West Virginia
Posts: 304
THOR #17154
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Thanks folks!
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Charlie and my pup Hans
2017 Thor Outlaw 38RE
Maysville, West (by God) Virginia
Good Sam member
FMCA member
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09-21-2020, 10:26 PM
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#10
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Junior Member
Brand: Thor Motor Coach
Model: Hurricane 33X
State: Alabama
Posts: 15
THOR #19119
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Dump your tank, then run the water through the flush input for about 5 minutes, then dump again. Repeat as necessary until the output is clean. I recommend having a clear fitting on the sewer hose so you can tell when it is clean.
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09-22-2020, 11:47 AM
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#11
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Senior Member
Brand: Thor Motor Coach
Model: 2020 Magnitude SV34
State: Florida
Posts: 4,153
THOR #12751
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I fill my black tank 3/4 full once or twice after the final dumping of a trip. I use a digital water gauge to know how much water is going in. I use a clear fitting so I can when the water is clear and free from debris for the most part.
I then add 5 gallons of water to the black tank and add Calgon Water Softener and Dish Soap. The water softener keeps the inside very slippery so debris doesn't want to stick to the walls and sensors causing false readings.
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09-22-2020, 12:26 PM
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#12
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Senior Member
Brand: Thor Motor Coach
Model: 2011 FW Hurricane 33T
State: England
Posts: 1,295
THOR #16471
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My opinion, but it seems like a lot of people use more water to flush their tanks than it took to initially fill it. I read/hear of different areas struggling to supply areas with potable water, then this?
I have no fancy flush system, just pour one bucket of clean water into the loo to 'rinse' when dumping, then one bucket with soap powder and Calgon to 'wash' while I drive to the next destination. A stinky job but it seems to work.
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09-22-2020, 09:08 PM
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#13
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Senior Member
Brand: Thor Motor Coach
Model: Forest River Forester 235
State: Indiana
Posts: 4,884
THOR #6826
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Quote:
Originally Posted by OldWEB
My opinion, but it seems like a lot of people use more water to flush their tanks than it took to initially fill it. I read/hear of different areas struggling to supply areas with potable water, then this?
I have no fancy flush system, just pour one bucket of clean water into the loo to 'rinse' when dumping, then one bucket with soap powder and Calgon to 'wash' while I drive to the next destination. A stinky job but it seems to work.
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I tend to agree! I do have a flush system but I don’t use it very often. Make sure there always is water in the tanks even after emptying and don’t worry about it. Never any troubles.
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09-22-2020, 11:39 PM
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#14
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Senior Member
Brand: Thor Motor Coach
Model: Hurricane 29M
State: Texas
Posts: 2,713
THOR #11781
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Quote:
Originally Posted by Pete'sMH
I tend to agree! I do have a flush system but I don’t use it very often. Make sure there always is water in the tanks even after emptying and don’t worry about it. Never any troubles.
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X3, repeated tank flushing is a waste of good water. I've been RVing since 1980 and never had a poop pyramid. Use sufficient water when flushing and all will be well, even without a fancy tank flush.
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Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
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09-23-2020, 01:05 AM
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#15
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Senior Member
Brand: Thor Motor Coach
Model: Windsport 29M
State: Pennsylvania
Posts: 223
THOR #10254
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Quote:
Originally Posted by Pete'sMH
I tend to agree! I do have a flush system but I don’t use it very often. Make sure there always is water in the tanks even after emptying and don’t worry about it. Never any troubles.
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I always leave a few gallons (with soap & Calgon or Cascade) after leaving from one site to another. But at end of season, since I live in a cold region, I do drain my tanks completely (or as complete as I can). The only appreciable amount of liquid I want in the tanks over the winter is RV Anti Freeze.
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Bryce, Gracia & Shadow (4 yr old mini-Daschund mix)
US Army vet- 82nd Airborne Div
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