arknoah

I agree with Paul.  We tried to use the green Thetford to be more environmental, but it didn't control the odor.  Of course, at the time, we were only using it half strength.  Even so, we found the Thetford blue to be the best.

Whenever we dump, we usually put in more water in the toilet and dump it again to get any stray pieces out and just to rinse it before putting in more chemical.  

Perhaps there is some other bacterial browth in your toilet that is causing the odor.  If the unit sat for a long time, this is possible.  You may want to use a tank or two of the Thetford blue then check out the odor again (or let it check you out!)  If it's still there, it might be time to see a dealer about your toilet.

Good luck.