The object was to sell homeowners on additives that will "…improve septic tank digestion of solids."
Don't fall for this scam. Below is what we wrote in Septic Systems Owner's Manual (There are 5 complete chapters from the book reprinted here, along with other septic info.). Click here.
Septic system additives, especially enzymes. (You don’t need to add enzymes; they’re naturally present in the sewage.) Beware of telemarketers or ads hawking additives claiming to avoid tank pumping. They actually break down the scum and sludge into small particles, which are then readily flushed out into the drainfield, increasing possibility of premature drainfield failure. The State of Washington has banned septic tank additives. In Tiburon, California, a homeowner recently added enzymes to a septic system that had been working perfectly well. Soon after, sludge moved out into the drainfield and the system failed.
I wrote an article that appeared in The Mother Earth News in 2008 about the sorry state of septic systems engineering and regulations in the US. To read it, click here.