I do not know if this info is of any use or not BUT - used to live in Mozambique and many people used cess pits which had to be cleaned out every few years. Many could not afford to have this done and some magic pills were thrown in to dry it out. I was told that an alternative to these expensive pills were yeast tablets. These would start working quickly and dry everything out. Have never tried it but it may give some of you ideas.
