Do an internet search to read what users state about them. I didn't read anything good about them. The best way to keep drains clean is to drop some dishwasher soap in the drain and follow up with 140 degree water; not boiling which can melt the pvc.
Dick_B 2003 SunnyBrook 27FKS 2011 3/4 T Chevrolet Suburban Equal-i-zer Hitch One wife, two electric bikes (both Currie Tech Path+ models)