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Old 06-07-2015, 05:59 AM   #1
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Full timers... Tanks open or closed

We are newbies and I have been opening and closing the tanks for 6 months and I am wondering if you can just leave them open always..
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Old 06-07-2015, 06:59 AM   #2
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Do not leave your black tank open all the time. You will end up with the MOUND and you really don't want to play with that. Water is your friend when it comes to the black tank. You can leave your gray water lines open all the time until it gets close to dumping your black tank. Shut the gray water valves for a day or two so you can flush out your hose after dropping your black water tank. Drop black tank, close black tank, open gray water valves to flush out your hose and pipe. If you have a black water flush, you may want to use that before using the gray water. Your black tank should be at the least 3/4 full before dumping. I never look at my gauges. When flushing the toilet, I look for a large bubble. That's an indication that the black tank is getting near full for me. I'm sure others will chime in.
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Old 06-07-2015, 07:25 AM   #3
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X2 for what Pipeman wrote. Also consider not leaving your stinky slinky on the ground.
Additionally, I suggest not leaving the gray valve full open. 1/2 or 1/4 will work. That way you can "work" it open and closed so when its time to break camp you will not have a stuck valve.

Note: I full timed in a 36CKTS.
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Old 06-07-2015, 08:03 AM   #4
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Quote:
Originally Posted by Pipeman View Post
Do not leave your black tank open all the time. You will end up with the MOUND and you really don't want to play with that. Water is your friend when it comes to the black tank. You can leave your gray water lines open all the time until it gets close to dumping your black tank. Shut the gray water valves for a day or two so you can flush out your hose after dropping your black water tank. Drop black tank, close black tank, open gray water valves to flush out your hose and pipe. If you have a black water flush, you may want to use that before using the gray water. Your black tank should be at the least 3/4 full before dumping. I never look at my gauges. When flushing the toilet, I look for a large bubble. That's an indication that the black tank is getting near full for me. I'm sure others will chime in.
X2!
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Old 06-07-2015, 10:18 AM   #5
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Definitely leave the black closed. I leave 1 grey open all the time and the other is closed to use to flush the lines after dumping the black.
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Old 06-07-2015, 10:29 AM   #6
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Did you read your owner’s manual? I am not trying to be a smart ___ but in your OM guide: It states for best results of your holding tanks empty them when they are at least 2/3 full.
Why? This prevents build-up of dry crude on the sensors and helps to eliminate odors from entering the trailer from open tank drains.
Another point you should rinse the black tank at least once a week to insure that all of the wastes has been removed when draining the tank. I have found that wastes will not completely leave the tank when the waste water is removed. We have taken between three and four two gallon buckets full of water and dump them down the toilet. This will help in cleaning the tank.
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Old 06-07-2015, 10:39 AM   #7
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Oh full timers but stay where we have full hook up. Always leave tanks closed until full and make sure both gray are full before dumping black.
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Old 06-07-2015, 01:21 PM   #8
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I agree with leaving the gray tank line open and the black tank closed. We have lived in our 390 rb for over a year. We had an issue with the sensor on the black tank not registering the correct levels. We were I. casa Grande As and had the tanks cleaned. We received quite an education that the owners manual does not suggest: first use the right chemicals, when you flush toilet paper, depending on how your system is built, I.E. tank is a straight shot or has a shelf before the holding tank, this means after flushing flush again with water. This helps avoid the toilet paper from building into a "pyramid" and causing blockages. The other things that help are, place a clear tube on the top of your sewer dump line so you can see when the tank is running clean, water is clear. Refill the black tank at 3/4s full and flush. This helps with keeping the sensors clean. I hope this helps.
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Old 06-07-2015, 01:58 PM   #9
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Quote:
Originally Posted by chisumbella View Post
We are newbies and I have been opening and closing the tanks for 6 months and I am wondering if you can just leave them open always..
No...never do this or you will end up with the dreaded "Pyramid of Poo"

I also disagree with leaving your grey tank open (the gray tank is a great "flush" for your hose after you dump your black tank.

If you have not done so already, get a high quality sewer hose - either a Rhinoflex or Wastemaster.

As far as maintaining your black tank just get this - it is the best thing you can do for your black tank

Chemical Dispensing Systems for RV & Marine | Blue Streak LLC

X2 on the black tank rinse. Most (if not all) modern RVs have a black tank rinse system. After *every* black tank dump I will run our turbo rinse for 20-30 min to make sure everything is cleaned out. Remember these are holding tanks, not septic tanks and routine maintenance is the cost of doing RV business
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Old 06-07-2015, 02:12 PM   #10
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grey water valve

I left my grey water valve open and was getting a sewer smell outside. My neighbor told me if I leave the grey valve open I can end up venting the parks sewer system through the vent on top of my trailer. Closed the grey water valve and the smell went away.
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