During the warm months I fill both tanks (at least 1/2 full ) of fresh water for storage after dumping and flushing. I dump them just before each trip, I installed a sewer dump connection to city sewer in my back yard. I also use the Happy Camper product. When in full use I dump them only when near full, even when I have sewer hook ups.
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It would seem that anything that cuts grease and helps water soak into dried materials will help get rid of dried poo. As long as one avoids anything outright harmful like formaldehyde a series of fill soak and dump cycles will clear it out. From there it's all a matter of what Fairy Dust one likes and how much money one feels a need to spend... The main issue seems to be getting it soaked and keeping it that way. ;-)
My process I have been doing for years now and have never had any buildup in black tank.
After dumping and flushing at RV park, I fill the tank about 1/4 full and add a 1/2 gal. of bleach. As I am driving the water is sloshing around in tank. At my next stop whenever, I dump .
Have never had any problems and tank is clean inside.
Bob & Karen & Buddy "yourkie"
2008 Winnebago 39W Destination DP
Hi Old Sarge,
I had this happen to me also. We had the motor home for more than two years. One winter season we had to stay at home. In the fall I did a through flush but I left the drain valve open. Four months later after we used the coach for the first time. We went to the dump station and had the same problem. The "stuff" that came out (with difficulty) was the slime that had built up over time and dried out. When it dried it peeled off the side of the tank in 4 to 5 inch pieces. After a couple more trips apparently all the "stuff" had peeled off and we had no more problems. Hope this helps.
I agree with continued use eventually removing this material. I've seen something similar in a tank that someone had used Draino in. Additional damage had been done to the bottom of the tank also by the heat from the chemical reaction of the Draino.
I'm not saying this has or has not contributed to your issue, but it's something to think about as we unknowingly abuse our sewage holding tanks by using the wrong products more often than admitted. Good luck with the resolution, I think you're on the right track with the proper flushing and use of bio products. Just a side note, I use dish washing detergent, Dawn, Joy, or any inexpensive brand in place of the chemical treatments. It seems to work find with side benefits of additional seal preservation, and level sensor cleaning. With continued use, nothing sticks to the inside of my tanks.
I had a problem with our black tank, it would fill up after one day of use. I took it to the dump station and used a high pressure attachment for the RV, then put in some Rid-X and let it sit for a week in a couple of gallons of water; then took it back to the dump station and did it again...problem gone. Don't know if it was the Rid-X or the high pressure attachment, but it worked.