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Old 04-23-2023, 12:58 PM   #1
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2008 27' Safari FB SE
2023 28' Pottery Barn
Delta , BC
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Bathroom sink emptying into main( black) tank

On my first trip in the trailer and I noticed my black tank is filling faster than my grey tank. Been here for 2 days and my black is now at 60%, and barely used. I also noticed ( from the monitor) that the % increased when I used the bathroom sink? At first I thought maybe sensors were reversed but when i run the kitchen sink the grey did increase. Thoughts?
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Old 04-23-2023, 01:33 PM   #2
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The bathroom sink does drain into the black tank on some floorplans. I know it does on my 30RB.
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Old 04-23-2023, 04:30 PM   #3
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I believe in all RB floor plans, the bathroom sink drains to the black tanks. It did on my 25RB. My new FB it does not. Both sinks drain to the Gray. I a RB, If not on full sewer hookups you really have to watch that bathroom sink usage. Maybe even hand washing , teeth brushing , etc all done in kitchen sink.
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Old 04-23-2023, 06:45 PM   #4
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I think it is good design to have our bath vanity sink drain into the black tank. This provides better utilization of the waste water tanks. And you have the added benefit of keeping the black tank wet which helps prevent "mounding" and aids good drainage. Besides, the bath vanity sink is usually close to the black tank so it saves some drain plumbing.

I've renovated 4 vintage Airstreams and in each case I drained the bath vanity sink into the black tank.

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Old 04-23-2023, 06:57 PM   #5
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Our 30RB also drains into the black tank. Initially, I didnít like it. However, it helps with emptying the black tank by having more liquid for dumping. We now like it. We are still able to boondock for 5 days, which is all we need.
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Old 04-24-2023, 08:41 AM   #6
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Good to know, I guess all RB units are similar, I wish the owners manual also told me that so I didnít have to be concerned.
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Old 04-24-2023, 10:14 AM   #7
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Our 1994 25-ft has the bathroom sink draining into the black tank. If we're dry camping or not on full hookups we'll just use the kitchen sink instead for most of the usual bathroom washing to avoid filling the black tank.

It was explained to me that this was done to ensure adequate water in the black tank for a complete dump when the black tank is dumped.
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Old 04-24-2023, 12:10 PM   #8
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Originally Posted by bugman3 View Post
Good to know, I guess all RB units are similar, I wish the owners manual also told me that so I didnít have to be concerned.

It is shown in the plumbing diagram.
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Old 04-24-2023, 12:46 PM   #9
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We routinely dump dish water down the toilet to conserve grey water space. For us the bathroom sink into black water also makes sense
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Old 04-24-2023, 02:26 PM   #10
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Now that I understand that, I need to figure out why it showed 98% filled after light use and when I emptied it this morning, it had hardly anything in it. Maybe the sensor is defective? Not sure how to gauge that.
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Old 04-24-2023, 04:13 PM   #11
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Traditionally, black tanks fill more slowly than the gray tanks, and for successful emptying the black tank should be as full as possible.
Therefore it is actually HELPFUL to have the bathroom sink empty into the gray tank.
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Old 04-24-2023, 07:44 PM   #12
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You may have a dirty sensor in the tank possibly toward the bottom of the tank giving you a "full" reading when it is not. Try cleaning your tank. You can search here on these Forums for some different processes to clean the tank.

One method involves half filling the black tank and then dump a couple sacks of ice cubes into the tank. Also include a healthy squirt of Dawn dish soap. You are already hitched up and now tow the trailer for maybe 20 minutes and let the ice abrade and the soap clean the walls of the tank. Now drain the back tank and put some water in it and see what the readout is saying. You might get lucky.

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Old 04-25-2023, 09:42 AM   #13
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Our 2015 23D bath sink also drains into black tank.
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Old 04-25-2023, 07:04 PM   #14
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I wish mine did. We can go 2 weeks on black and one week on gray. I'd rather have that be 11 days with both.
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Old 04-25-2023, 08:12 PM   #15
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Originally Posted by JCWDCW View Post
We routinely dump dish water down the toilet to conserve grey water space. For us the bathroom sink into black water also makes sense
JCW
Ditto. We do the same thing. The detergent in the dishwater doesn't hurt when try to keep the black tank clean either.

This helps balance out the amount of water in the black vs grey tanks as well. Helps when boondocking.

Side note: we always fill up the black tank using the black water flush system before dumping the black tank. Subsequently, it usually takes 2 additional full black tank flushes before the water being dumped is fairly pristine (relatively speaking, of course)
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Old 04-30-2023, 01:26 PM   #16
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Quote:
Originally Posted by dbj216 View Post
You may have a dirty sensor in the tank possibly toward the bottom of the tank giving you a "full" reading when it is not. Try cleaning your tank. You can search here on these Forums for some different processes to clean the tank.

One method involves half filling the black tank and then dump a couple sacks of ice cubes into the tank. Also include a healthy squirt of Dawn dish soap. You are already hitched up and now tow the trailer for maybe 20 minutes and let the ice abrade and the soap clean the walls of the tank. Now drain the back tank and put some water in it and see what the readout is saying. You might get lucky.

David
For a good illustration of the benefits & limitations of the ice cube approach see this You Tube:
https://youtu.be/iH6acEmqvcw
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Old 08-21-2023, 08:32 AM   #17
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Last year, I exchanged my RV, including my prior 25RB. The black tank receives drainage from the bathroom sink. In contrast, both sinks in your new FB model drain into the grey tank. This explains why, while using the bathroom sink, you saw a rise in the black tank's level. Doing things like brushing your teeth and washing your hands at the portable sink will free up room in the grey tank and help you manage tank levels more effectively, especially if you have a partial sewer hookup. Hope this was helpful.
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