Free 7 Day Trial RV GPS App RV Trip Planner Campground Reviews RV Maintenance Free 7 Day Trial ×
 

Go Back   Thor Forums > Thor Tech Forums > Maintenance and Repair
Click Here to Login
Reply
 
Thread Tools Display Modes
 
Old 12-14-2020, 11:28 PM   #1
Member
 
Brand: Thor Motor Coach
State: New Hampshire
Posts: 79
THOR #17462
First Time Flushing Tanks

I'd appreciate some advice, I'm scared lol.

This is my first motorhome, and first time flushing the tanks.

I found a free dump station at the Brendan Byrne State Forest on sanidumps.com

I have a grey and black tank of unknown full-ness (I'm adding new sensors soon).

So I'm going to drive to this dump station and... is this the process?

1. Open Black, let it drain.
2. Open Grey, let it drain.
3. If there is water running, I'd fill up the black/grey tanks (with a hose?) and then drain them again?

Thanks, I appreciate the help for a newb!

__________________
1996 Hurricane 30'
NateHTP is offline   Reply With Quote
Old 12-14-2020, 11:34 PM   #2
Senior Member
 
ducksface's Avatar
 
Brand: Thor Motor Coach
Model: 2018 24.1 AXISSIXxSIX
State: Arizona
Posts: 3,914
THOR #13932
That will do just fine.
Make sure the bayonets lock on the outlet.
Close the valves when you're done.
__________________
Below is a link to most of my modifications either accomplished or pending.
https://www.thorforums.com/forums/f2...n-18996-3.html

Click on my pictures then click the pop-up for a full screen zoomable picture.
ducksface is offline   Reply With Quote
Old 12-14-2020, 11:35 PM   #3
Member
 
Brand: Thor Motor Coach
State: New Hampshire
Posts: 79
THOR #17462
I was also just reading about heating pads (I'll need to install some of these!) and RV Digest-It solution, etc. I have no idea what's in my black/grey tanks... I haven't emptied this since I bought it, so maybe pouring this stuff down before doing my first empty would be wise?
__________________
1996 Hurricane 30'
NateHTP is offline   Reply With Quote
Old 12-14-2020, 11:44 PM   #4
I Think We're Lost!
 
Bob Denman's Avatar
 
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 21,733
THOR #8860
If you're going to add chemicals to your tanks: do it now. Driving to the dump station will give them some "sloshing time" in your tanks.
Once you're there: black tank first; then the gray. Close the valves and cap them off. [I]
(And make sure your slinky lugs are fully engaged...)
Good luck!
__________________
Bob Denman is offline   Reply With Quote
Old 12-15-2020, 12:16 AM   #5
Senior Member
 
Brand: DRV
Model: 44' Santa Fe
State: Montana
Posts: 373
THOR #2053
DO NOT add any chemicals to your tank!!!Unless Bob is buying. Him and the chemical companies are the ones supporting flushing money down the drain. It is a holding tank, not a septic system. Nothing is in there long enough to digest in any form. Especially on the short trip to the dump!! Just plain water at each flush of the toilet is all that is needed
20 years doing it with zero problems. Saved enough $$ to buy my last rig!!

Bill
__________________
If you are afraid to speak the truth out of fear of what others may think, it says a lot about who you are and what you will settle for.
Porkchop is offline   Reply With Quote
Old 12-15-2020, 12:30 AM   #6
I Think We're Lost!
 
Bob Denman's Avatar
 
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 21,733
THOR #8860
. I'm in for ten bucks...
__________________
Bob Denman is offline   Reply With Quote
Old 12-15-2020, 12:34 AM   #7
Senior Member
 
Popfla's Avatar
 
Brand: Still Looking
Model: S.O.B.
State: Florida
Posts: 670
THOR #14543
Exclamation

Just to clarify:

1. Open Black, let it drain.
1a. Close Black.
2. Open Grey, let it drain.
2a. Close Grey.

You should never have both the black and grey valves open at the same time.

If you are going to rinse out the black tank, either by way of an installed flush system such as San-T-Flush, or by running clean water down the toilet, do it before emptying the grey tank. Use the contents of the grey tank to flush out the sewer hose.

Good Luck!!
__________________
Ed
Some Other Brand w/2020 Jeep Gladiator Toad
Living The Dream in "God's Waiting Room"
Popfla is offline   Reply With Quote
Old 12-15-2020, 12:44 AM   #8
Member
 
Brand: Thor Motor Coach
State: New Hampshire
Posts: 79
THOR #17462
Quote:
Originally Posted by Porkchop View Post
DO NOT add any chemicals to your tank!!!Unless Bob is buying. Him and the chemical companies are the ones supporting flushing money down the drain. It is a holding tank, not a septic system. Nothing is in there long enough to digest in any form. Especially on the short trip to the dump!! Just plain water at each flush of the toilet is all that is needed
20 years doing it with zero problems. Saved enough $$ to buy my last rig!!

Bill
Wonderful and logical advice. Thank you!!!
__________________
1996 Hurricane 30'
NateHTP is offline   Reply With Quote
Old 12-15-2020, 12:45 AM   #9
Member
 
Brand: Thor Motor Coach
State: New Hampshire
Posts: 79
THOR #17462
Quote:
Originally Posted by Popfla View Post
Just to clarify:

1. Open Black, let it drain.
1a. Close Black.
2. Open Grey, let it drain.
2a. Close Grey.

You should never have both the black and grey valves open at the same time.

If you are going to rinse out the black tank, either by way of an installed flush system such as San-T-Flush, or by running clean water down the toilet, do it before emptying the grey tank. Use the contents of the grey tank to flush out the sewer hose.

Good Luck!!
I def might have made this mistake. Thank you so much!

Noted your point about using grey tank contents to flush the sewer hose. Thank you.
__________________
1996 Hurricane 30'
NateHTP is offline   Reply With Quote
Old 12-15-2020, 12:47 AM   #10
I Think We're Lost!
 
Bob Denman's Avatar
 
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 21,733
THOR #8860
San-T-Flush...
Everybody has their own routine; and here's mine:
After dumping the tanks: I put about half a cup of dish soap down the toilet. I then hook up the water supply to the system, and leave the valve closed I put what I figure to be about ten gallons of water back in the tank. I then shut off the system, and open the valve. I keep running the system, and draining until I get suds-free water coming out. (Maybe 4 or 5 sequences...)
__________________
Bob Denman is offline   Reply With Quote
Old 12-15-2020, 12:59 AM   #11
Member
 
Brand: Thor Motor Coach
State: New Hampshire
Posts: 79
THOR #17462
Quote:
Originally Posted by Bob Denman View Post
San-T-Flush...
Everybody has their own routine; and here's mine:
After dumping the tanks: I put about half a cup of dish soap down the toilet. I then hook up the water supply to the system, and leave the valve closed I put what I figure to be about ten gallons of water back in the tank. I then shut off the system, and open the valve. I keep running the system, and draining until I get suds-free water coming out. (Maybe 4 or 5 sequences...)
Thanks a lot! Seems like that would use a lot of water... do the places you dump always have water available, and if they do they don't mind you using so many gallons?
__________________
1996 Hurricane 30'
NateHTP is offline   Reply With Quote
Old 12-15-2020, 01:01 AM   #12
Junior Member
 
Brand: Thor Motor Coach
Model: Vegas 24.1
State: Oklahoma
Posts: 11
THOR #8362
Quote:
Originally Posted by NateHTP View Post
I'd appreciate some advice, I'm scared lol.

...So I'm going to drive to this dump station and... is this the process?

1. Open Black, let it drain.
2. Open Grey, let it drain.
3. If there is water running, I'd fill up the black/grey tanks (with a hose?) and then drain them again?

Thanks, I appreciate the help for a newb!

Practice hooking up the hoses before you go just to get the hang of it. Without draining of course. That's the hardest part, making sure they are locked on. When you finish, make sure the valves are completely closed. Don't ask why I know this. At least it was the grey.
__________________
Papafoos is offline   Reply With Quote
Old 12-15-2020, 01:19 AM   #13
I Think We're Lost!
 
Bob Denman's Avatar
 
Brand: Still Looking
Model: Tiffin Wayfarer 24 BW
State: New York
Posts: 21,733
THOR #8860
Quote:
Originally Posted by NateHTP View Post
Thanks a lot! Seems like that would use a lot of water... do the places you dump always have water available, and if they do they don't mind you using so many gallons?
Nobody has ever tried chasing me out of town with a pitchfork yet...
Water intensive: yes!
But your slinky will always be minty fresh!
__________________
Bob Denman is offline   Reply With Quote
Old 12-15-2020, 01:28 AM   #14
Senior Member
 
Brand: Thor Motor Coach
Model: Siesta 24SS
State: California
Posts: 1,710
THOR #12698
It is really a simple process. Just make sure the slinky hose is fully attached to the motor home dump BEFORE you open the dump valve. Sometimes it feels attached and then once you open the dump valve it lets loose and you now have a big mess to clean up. Also wear rubber gloves for this process.

Paul
__________________
paulwadley is online now   Reply With Quote
Old 12-15-2020, 03:56 AM   #15
Senior Member
 
Brand: Thor Motor Coach
State: Missouri
Posts: 182
THOR #9178
Make sure the discharge end has the elbow securely positioned in the opening so it don't jump out of the drain when the slug of waste water hits it
__________________
lwmcguir is offline   Reply With Quote
Old 12-15-2020, 04:10 AM   #16
Senior Member
 
Travelin' Texans's Avatar
 
Brand: Redwood
State: Texas
Posts: 1,501
THOR #3610
Not necessary to "fill" the tanks completely to rinse, 5-10 gallons should be sufficient.
A clear section should be added at the rv end to be able to check when it's running clear.
ALWAYS connect the sewer end of the hose securely 1st gen while holding the rv end as close as possible remove the cap from the rv to try a run the dab that comes will go down the hose.
If you get a cap with the water hose fitting (see below) on it remove that small cap 1st, all the valves tend to leak a bit & there could be several feet of piping that doesn't completely drain that WILL run out 1st.
Name:  download.png
Views: 1041
Size:  4.2 KB
As mentioned the tank chemicals are not needed, once rinsed & flushed add a couple gallons of water to the black tank then add a good healthy squirt of cheapo dish/laundry detergent, this will work to keep valves lubricated & work as well as the expensive tank chemicals.
__________________
Danny & Linda
Sold '13 Thor Redwood 36 FB
Traded '13 GMC Denali DRW D/A
Currently RV & truckless
Replacement undetermined
Travelin' Texans is offline   Reply With Quote
Old 12-15-2020, 04:53 AM   #17
Senior Member
 
dkoldman's Avatar
 
Brand: Still Looking
Model: Sunstar 29VE Winnebago
State: Texas
Posts: 2,146
THOR #13058
Couple of questions

For those that don't recommend Tank Chemical treatments.

Doesn't it matter how long you may go in between dumps and the ambient temperatures? In Texas heat, I must have something. I use a few ozs of Thetford (blue stuff) I have tried some others chemicals but found them to be worthless. While it does breaks down toilet tissue etc, it does it quicker than yiu think, but that is not my main reason for using. It is a deodorant and it does help to control the smell from backing up from the toilet; although the plumbed vent helps too. I keep it with thetford with me; but only use it selectively. I can certainly tell when it has been used versus not been used.

On words of wisdom to never open black and gray the same time.

I have never done this; but have read about it on internet so it must be good. I have heard after you have drained your black tank, rinsed or whatever you do, leave the black valve open and then open the gray so the gray backfills the black and then open the main valve?

What say you...
__________________
2019 Sunstar 29VE Sumo Springs; Safe T Plus; EC-30 AGS; Vmax 250ah AGM; Nighthawk X4 AC2200 WiFi EX7300; H/W Heater / Chassis Disconnect Switches; Southwire Surge Guard 44270 & 34951 w/Monitor 40301; Jet Flo Macerator; Alpine SPE500 Speakers; Visio M21D-H8R
dkoldman is offline   Reply With Quote
Old 12-15-2020, 05:05 AM   #18
Senior Member
 
Brand: Thor Motor Coach
Model: Hurricane 29M
State: Texas
Posts: 1,643
THOR #11781
I always open the gray tank before closing the black. Chemical deodorants are also not required.
__________________
Lt Keefer
2018 Hurricane 29M
CHF, Saf-T-Plus, SumoSprings
Lt Keefer is offline   Reply With Quote
Old 12-15-2020, 06:11 AM   #19
Senior Member
 
Brand: Thor Motor Coach
Model: AXIS 25.3
State: California
Posts: 120
THOR #20631
My FIL used this method:
1. Dump black.
2. Lift slinky above bottom of tank level and open grey which then back flushes into black. Wait 10 seconds or so. Close grey and lower slinky to redrain black.
3. Repeat step 2 A couple of times. Then close black valve.
4. Drain the rest of the grey tank. Hose is clean enough to store.

Saves time at dump stations since you don't use the flushing system.

If you have full hookups then just do black, grey, and flush away.

Happy travels!
__________________
Paul Woods
2018 Axis 25.3
Previous trailers: 2016 Wildwood X-lite 231RKXL, 1998 Thor Tahoe Lite 19UD, 1990 Starcraft Meteor tent trailer.
Wandering Woods is offline   Reply With Quote
Old 12-15-2020, 06:28 AM   #20
Senior Member
 
Brand: Thor Motor Coach
Model: XG 32 Omni
State: Missouri
Posts: 726
THOR #4243
All good advice posted above. Just watch RV with Robin Williams on what not to do when dumping your tanks.
__________________
kwplot34 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


» Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by Thor Industries or any of its affiliates. This is an independent, unofficial site.




All times are GMT. The time now is 01:28 PM.


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0 PL2