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Old 06-10-2014, 11:55 PM   #1
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Back flushing

After pulling the knife valves to dump your black water, does anyone hook up to back flush hose, close the black water valve and fill up the tank to almost full and let it out again. I watch my level indicator and when it reads 3/4, I go out and open it up. Does this make sense or is it bad to do?
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Old 06-11-2014, 12:15 AM   #2
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I leave my valve open and flush many gallons of water down through the toilet with a wand to make sure everything is clean I then close it, fill the tank and dump at least twice before I'm done. I add about 5 gallons water and drop a bag of chemical and I never have any stinky problems even in the hot summer.
I can go at least a week before I need to dump black water. I never dump it unless it is half full or more or I'm going home.
I use chem bags from Wally World and have no issues. 1 bag a week I can afford for those who do it the other way.
I firmly believe that smelly black tanks come from not cleaning good when they are dumped, period!
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Old 06-11-2014, 01:28 AM   #3
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That's a good solid procedure Cliff. I don't have a wand, but will get one. I was more or less wondering if closing the dump valve and letting it fill up with the back flush hose was a good idea. Sounds like it's about the same as using a wand.
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Old 06-11-2014, 05:48 AM   #4
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If you know you are going to a full hookup site, fill the tank with water at home, add a bag of ice cubes, drive there and dump.....The motion and ice will knock off anything stuck to the sides
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Old 06-11-2014, 05:56 AM   #5
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when I got my trailer they told me to make sure the dump valve was open or it could blow the seal in the toilet
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Old 06-12-2014, 12:44 AM   #6
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It will surprise you how much "stuff" stays behind when you just dump and refill without using a wand down the toilet to wash all the corners and sides. Just a back flush or filling and flushing won't get it done in my book. You need a strong spray to flush all the sticky &^%# off of the walls and floor of the tank. Ice may work. I think it will melt pretty fast into the water but many here do it so it's worth a try.
My way works for me.
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Old 06-12-2014, 12:48 PM   #7
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I rinse out my black tank with this. http://www.campingworld.com/shopping...on-valve/27868

This goes on the outlet of your RV. After you dump the black, close this valve, open the black valve and then the grey water. This should force some of the grey water into your black tank. Then close the grey and open the twist on valve and this should do a pretty good flush. Just make sure you have a lot of grey water so you have some left over to rinse your drain hose.

I have also used this when camping with no waste hookups to transfer some of the full grey water to my near empty black tank.

Its also a great emergency valve if you black or grey water valve were to ever fail.

All these uses make this item a must have.
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Old 06-12-2014, 12:55 PM   #8
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Quote:
Originally Posted by mhjr5500 View Post
when I got my trailer they told me to make sure the dump valve was open or it could blow the seal in the toilet
Your blackwater tank should have a air vent to the roof to prevent this. I can't see why they would tell you this other than a poorly designed RV.
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