We used to buy an RV toilet paper (this one
https://www.amazon.com/Thetford-03300-Aqua-Soft-Toilet-Tissue/dp/B073Z5KFGC/ref=sr_1_14?keywords=Thetford+Quick-Dissolve+Rv+Toilet+Paper&qid=1576464250&sr=8-14 ) and now we see no difference except the price! We used to believe that we should use a toilet paper that is made specially for RV toilets. That it ensures no clogging and it is rapid-dissolving. But after some time we just started to buy a regular toilet paper package which says "septic safe" just like the RV stuff.