Don't know, personally I prefer traditional and the most rational approach. Which is that you try to save your drain from litter and if it gets clogged you just call Handy Kith and ask a human handyman to come to your house and clean it. Those chemicals I think are for easier cases, and more of advertisement nature of course. You can't use them all the time. Plus those handymen can perhaps consult you about how to use your sewerage without trouble.