Originally Posted by hcarlile73c
At every empty I add softener and detergent. And it has been doing well.
I am just wondering what it is that those items are doing well if you still have tank odor problems? I have been an RV owner for many years and always believed that part of the purpose of tank additives was odor control?
Leaving the dump valves open can be a part of the odor problem but the P traps should not go dry in only 1 week. It is also possible that the plumbing vents under each sink are part of the problem and may need to be replaced. You can find directions here.
For the black tank the flush valve of the toilet should prevent this but some toilets also have an overflow that requires water in it much like the P traps on the gray water system.