I must admit, I don't know much about septic tanks because I never felt much attracted to inspect them. Yet, our homes we built in Spain all had septic tank systems and some of the properties we remodeled had systems which had been working for over 20 years while empties only once! All the while it is customary there to flush about everything down the toilet.
Most of today's hygienic toilet papers should decompose almost instantaneously. It's only been in Latin American countries that I have faced the "culture" of stacking up used paper in plain few next to a WC. This has, in my opinion based on my septic tank user experience in other countries, nothing to do with septic tanks but with bad plumbing.
I think the key is to build it right, in a generous size and have good plumbing using the right sizes of pipes, tubes and slopes.
I might also question the bacterial systems in a world where chlorine is found in the water and so many products used in most any household. Chlorine kills bacteria... at least that's the idea(?). Short, I don't know how that can work together.
... J-D.
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