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Old 08-08-2014, 07:43 PM   #1
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1975 29' Ambassador
1975 31' Sovereign
Lutz , Florida
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flushing out the Black Water Tank...

Been in the AS for a little over a month now, and had to flush out the Black Water Tank already. Just thought that that was pretty quick to have to do that, it was a regular maintenance thing, but didn't think I was going to have to do it so soon. Any thoughts, or comments??

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Old 08-08-2014, 08:28 PM   #2
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2006 19' Safari SE
Tucson , Arizona
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The way your post is worded makes me think that perhaps you are hooked up to a sewer system ... and might be leaving your black tank valve open all the time. If you do this, the liquids will drain away and the solids will stay behind to build up and cause potential problems and more than usual need for black tank flushing maintenance. Even if you are physically hooked up to the sewer with a hose, you should leave the black tank valve closed until the tank is 3/4 full or better... then dump ... and close the valve until it's time to dump again. The force of the accumulated liquid will help wash out the solids.

You can leave your gray tank valve open all the time if you want, without causing issues ... but you might consider closing it the day before you plan to dump the black tank... The after you dump the black tank, close the black tank valve and dump the grey tank...the grey water will help rinse out the sewer hose. Then you can leave the grey open until the next time you plan to dump the black. There is no need to unhook the sewer hose each time unless you want to.

If you use chemicals in your black tank, they will help the solids break down as you wait to dump and will help control odors. Also remember to leave a little water in the bottom of the toilet bowel to keep sewer odors from coming up through the toilet.

If you follow this cycle you should not have to do a complete and thorough flush out all that often...

Good luck!

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Old 08-08-2014, 09:59 PM   #3
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What TB Rich said - about "the black hills" especially.

Even if you're a single person draining and rinsing the tank - once a week in hot weather, a bit less often in cool weather. It doesn't have to be full to be ripe.

And putting about 5 gallons in the gray tank while draining the black tank is a good "rinse" for the stinky slinky after draining the black tank.

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