The bleach probably wouldn't hurt, except for the smell. I just haven't seen the necessity. I do use Thetford blue when the weather is warm and a more environmentally friendly product when it is cooler. I never considered not using a chemical, but the idea has merit if you have hookups. It would be very easy to do a quick dump (no pun intended!) every couple of days before the odor gets noticeable. The method I use is designed to keep the insides as clean as possible which hopefully lessens operational problems as well as smells.
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