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Old 06-20-2016, 03:28 PM   #29
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Originally Posted by BFlinn181 View Post
Math can be your friend.
WOW, I read that as "meth" the first time through!!

Ours seems to have a build up as it never reads less than although I did get it to go lower a few times ago. Right now we aren't using the rig due to DW's health issues so I started putting RidEx in in several months ago. Add about 1 tablespoon every couple weeks in water. Headed out over the 4th and will give it a good rinsing too. I think the original owner used the SaniCon all the time and it doesn't have a high enough flow to keep the solids in suspension and lets the liquid drain away.
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Old 06-20-2016, 03:41 PM   #30
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It's not a case of sensors reading wrong when it says full it is at the bottom of toilet. It just gets there real fast
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Old 06-20-2016, 04:08 PM   #31
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It's not a case of sensors reading wrong when it says full it is at the bottom of toilet. It just gets there real fast
Our Thor Ace 29.3 only has a 28 gallon black water tank and the bathroom sink drains into it as well. You think yours fills quickly? With just the two of us, three days max. What were they thinking when they designed that part?
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Old 06-20-2016, 05:23 PM   #32
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Our Thor Ace 29.3 only has a 28 gallon black water tank and the bathroom sink drains into it as well. You think yours fills quickly? With just the two of us, three days max. What were they thinking when they designed that part?
Perhaps that water weighs 8.4 pounds per gallon? Also the space between the frame rails has to be open for the drive shaft, not leaving a lot of space for a larger tank.
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Old 06-20-2016, 11:10 PM   #33
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I have been frustrated with this same issue, interesting reading.
And here I have been thinking I was gonna have to climb right down into that tank and scrub it by hand.
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Old 06-21-2016, 04:38 AM   #34
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FWIW - if one reads the specs it is common for the black and grey tanks to be about half the water tank each. Otherwise there is always using a bucket or whatever to measure how much water it takes to fill the tank to get the capacity. Two of us can do two days and a bit with a shower each on a 28 gal black tank.

Given what we have found out so far I would be either measuring or just doing a good soak. Either way I suspect there is not enough tank capacity for a crowd on the weekend. That would also leave me thinking that there is a good chance the previous owners tried leaving the black tank open at a FHU site for a while thus loading the tank with crud.
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Old 06-22-2016, 01:52 PM   #35
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Ditto on most of my previous RVs
My kitchen sink drains into the black tank. The shower and bath sink only go to the gray water tank.
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Old 06-22-2016, 06:35 PM   #36
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Easy way to see how many gallons the black tank will hold is with one of these.

https://www.amazon.com/P3-P0550-Wate...ds=water+gauge

Bring a hose into the bathroom and put the gauge on the end. Fill the tank through the toilet, once the tank is full you'll see how many gallons went into it.
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Old 06-22-2016, 06:52 PM   #37
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My Fleetwood Bounder the bath sink ran in the black tank.
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Old 06-22-2016, 09:27 PM   #38
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Make yourself a high pressure tank washer. I used 4' of 3/4" CPVC, a termination cap on one end, then drilled a 1/8" hole in one side of the cap. The other end I glued on a 3/4" pipe thread fitting, then screwed on a brass garden hose fitting and added a 1/4 turn shutoff valve to that.
Cost_ about $10 to make a high pressure washer for my black tank.
Someone said they used a pressure rinser in their grey tank; please tell me how you did that.
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Old 06-23-2016, 05:38 AM   #39
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I had the same problem first weekend out with my used MH. The local camp store sold me a flush hose made for the problem that is stiff enough to go up into the tank from the discharge outlet and you connect a water hose to it and it sprays the inside of the tank. It is a bit tricky to do without making a mess but it did the job and since then no problem. I carry it with me all the time.
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Old 06-23-2016, 05:46 AM   #40
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Ranger Rick, if your poking a wand up the discharge does all the water your spraying dump out the open drain on to the ground and also run down the hose to your hands?
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Old 06-24-2016, 05:52 AM   #41
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Ranger Rick, if your poking a wand up the discharge does all the water your spraying dump out the open drain on to the ground and also run down the hose to your hands?
It was very tricky to say the least. You will need a helper. Connect your flexible drain hose to the outlet and then have your helper hold the end up above the level of the tank. Insert the flush hose through this flex hose and into the tank. When you are finished remove the flush hose, close the drain and keeping the drain hose connected and holding the centre of it higher than the tank level, insert the drain hose into the dump opening. Now you can lower the drain hose and dump the tank normally. We actually did it without making a mess.
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