Rich D.
New England
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Joined: 03/10/2003
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My recollection is that late 60's and early 70's RV's had a black tank only. The grey water just dumped on the ground. In the mid 70's another tank was added for the grey water. Most all manufacturers have been supplying two tanks ever since. Some run a sink into the black tank as the plumbing layout (floorplan) makes that eaiier.
Two tanks do have some advantages as stated by posters here, shower backup, hose rinse, etc. Ideally the set up of a two tank system would include a designated grey water transfer pump to occasionally add grey water to the black tank if necessary. This would let the RVer manage the tank capacities to suit the situation.
Rich D. Wanderlodge M450 LXi
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ArchHoagland
Clovis, CA, USA
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I don't have two tanks. I've got four tanks.
Two gray and two black.
2004 Monaco La Palma 36DBD
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wa_desert_rat
Central Washington State
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Rich D. wrote:My recollection is that late 60's and early 70's RV's had a black tank only. The grey water just dumped on the ground. In the mid 70's another tank was added for the grey water. Most all manufacturers have been supplying two tanks ever since. Some run a sink into the black tank as the plumbing layout (floorplan) makes that eaiier.
This is my recollection as well. In fact, we own a 1972 Streamline Princess with only a black tank; grey water just runs out. We put a 5-gallon bucket under it.
Craig
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kidkasha
Ventura County
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Is it possible to dump grey into black if grey is full and black pretty empty, and how.
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roadweary
southern Utah
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ArchHoagland wrote:I don't have two tanks. I've got four tanks.
Two gray and two black.
Nice! How much capacity?
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Rich D.
New England
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kidkasha wrote:Is it possible to dump grey into black if grey is full and black pretty empty, and how.
Simple, install a designated waterpump drawing from a low spot on the gray tank and pump it to the top of the black tank. Install a check valve at the outlet by the black tank to prevent backflow. Run your pump and watch guages/lights for the black level rise and the grey lower.
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SRT
Head of the Lakes, MN
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Our motor home has 2 40 gallon tanks - one for gray water and the other for the black water. With just two of us our black tank has gone 10 days. The gray water about 7 days.
SRT
2000 32' HR Vacationer with Banks
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ClassAGeek
NYS
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Joined: 05/20/2011
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Rich D. wrote:Simple, install a designated waterpump drawing from a low spot on the gray tank and pump it to the top of the black tank. Install a check valve at the outlet by the black tank to prevent backflow. Run your pump and watch guages/lights for the black level rise and the grey lower.
That solution would satisfy customers on both sides of this issue. With so many manufacturers looking to distinguish themselves, few have this option. In fact, are there any aside from DIY'ers?
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1995brave
San Antonio, TX
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My Winne has three, two gray(one shower), and a black. When i dump i hook up the hose and open and close the gray valve just to check the hose for leaks. Then i pull the black, then the gray, and then the shower.
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Old-Biscuit
Across the USA
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Joined: 06/20/2009
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Rich D. wrote:kidkasha wrote:Is it possible to dump grey into black if grey is full and black pretty empty, and how.
Simple, install a designated waterpump drawing from a low spot on the gray tank and pump it to the top of the black tank. Install a check valve at the outlet by the black tank to prevent backflow. Run your pump and watch guages/lights for the black level rise and the grey lower.
Easier still......
Just install another valve on main drain line. Leave it closed, open both tank valves and let tanks equalize.
You an even purchase a 'twist on' valve for end of drain line.
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