When it comes to articles about septic treatment there are many, most with a financial connection or interest… few are very credible or are marginally credible with heavy content on the marketing end… none meant or closely related to RV use or short term holding tanks such as a RV has…
When it comes to breaking down or digesting the solids these chemicals are a complete waste because even if the chemicals are activated in a few hours no noticeable digestion or break down is accomplished in the few weeks its held there… the bacteria needed to do that is already there and grows at a rate that naturally accomplishes that process…
What I have never seem is credible evidence that anything but water is needed for good short term holding tank operation… killing the smell (bleach) is killing the natural bacteria breaking down the solids that drives the smell, and can be harmful to the eventual septic or disposal system the effluent ends up in…
If smell inside the coach is a problem adding chemicals can mask the smell with the new disgusting chemical smell to replace the old smell…
But if the system is functioning right the odor is drafted out of the holding tank through the vent and dissipated into the air and diluted sufficiently by the air to not cause a problem in the first place…
Adding anything but water in unnecessary and maybe more harmful than good in the grand scheme of things…
Proper use of water would eliminate the need for cleaning beyond light flushing now and then with a good flush before long term storage…