Tank Dumping

Good suggestions here, I also use a biological treatement, don't recall the brand but has always been effective. We are newbies so have only camped within 1.25hrs from home, no extended trips. No matter how or when you dump, do it effectively. I have a small TV so dump after camping. I believe the posts here that say dump a nearly full tank. On quick weekends I fill my water can and add as much water to the tank as possible. I use a plug or toilet brush to hold the toilet flush open and try to move as much of the fresh water to the black tank as possible. Last trip of the season 3 weeks ago I double dosed the treatment, and got the black nearly full. We picked a slow time at the dump station and dumped and flushed for about 30mins.  You'll never get it completely empty as I don't believe the tanks slant enough towards the drain. When I winterized last weekend, I drained the tank into a disposable bucket and carried about 3 gals of slightly murky, barely smelly water into the basement toilet, it smelled more like the tank treatment. Conclusion is that the tank was better than sufficiently flushed. Tanks treatments are important and a nearly full tank will "float" material out better than a slightly full tank.

Another note, dumped about 3 gals from the grey tank that stunk to high heaven. For all my research and prep, I failed to realize the grey tank needs treatment too. I'll flush it good come opening day and use a proper treatment.

+1 to SH and NC, there's a reason all waste water in a house goes to a common point. It's all waste water. It is the same as black inre to contaminated.

Question to dr2428 - you don't mention your backflush at all, I use my backflush to add water to black tank, gray tank is different but it doesn't have toilet paper in it. Have used bucket with treatment to add to gray tank, but normally just fill with water pump or city water.

That's a reason why I moved mine to location near black water flush, why put it on opposite side.

Mcarter, I agree locating the flush on the opposit side from the drain dos not seem to make sense, maybe there is some legal reason or other such thing.

If you are quiet enough you can here the spray.