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Old 11-24-2018, 01:56 PM   #1
Senior Member
 
Brand: Thor Motor Coach
State: Alabama
Posts: 102
THOR #13703
Flushing tanks

Does anyone have manuals on how to drain and flush my 2018 Thor Miramar 35.3 tanks

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Old 11-25-2018, 02:06 PM   #2
Senior Member
 
Brand: Thor Motor Coach
Model: 2013 31L
State: Florida
Posts: 2,184
THOR #908
I can't point to a manual, but no doubt you'll find volumes on the subject on this and other forums using a google search

basically, my 2 cents worth
make sure the black tank has a high level (many folks will give different numbers....more than x%, etc..) but I don't think it's all that critical, just make sure you don't habitually drain the black when there's almost nothing in it. Once in a while won't kill it...it's certainly not that critical...

make sure there's enough volume in the grey tank to rinse out the hose....

then
1) drain the black first.
2) then drain the grey. This pushes the left over waste out of the pipe with clearer grey water.
3) Then use the hose at the dump station to do a quick rinse inside the hose
4) run a few gallons of water into the black tank (so valve seals stay wet and to prime the tank. Want more liquid than solids in there). This does not have to be done at the dump station, later is fine....just pretty soon...can be done with the flush connection, or just by flushing the toilet a few bowls full
5)done

flushing isn't really necessary...ever.... no need to back up a line at the dump station. Do it if you feel the need and there's no line behind you...or at home.

make sure gaskets are in the stinky slinky when hooking up (no leaks is the goal!)
many folks don't use tank chemicals at all, and have no problems.
just use plenty of water when flushing poo

In my experience I keep a bottle of the blue stuff handy, and use it once in a while
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Old 11-25-2018, 03:39 PM   #3
Junior Member
 
Brand: Thor Motor Coach
Model: GR22
State: California
Posts: 14
THOR #10474
I’ve had good success with my flushing method, which is similar to others.

1. Drain the black tank.
2. Fill the black tank with fresh water until full, then drain.
3. Repeat step 2 until flush runs clear. This usually only requires two full flushes.
4. Add about 10 gallons and about have a cup of Pinesol.
5. Drain the grey tank.
6. Fill the grey tank with fresh water until full, the drain.
7. Drain fresh water tank.
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