Easy to use but.....
These didn't help keep my drain from clogging up.  I put these in all my drains and of course, they don't all clog up but one of them did and the only way to open it was with the good ol' fashioned drain opener you get at the store.  I wouldn't get anymore of these.  I don't believe they really do anything - that's not a scientific opinion but just my own.
Rating: 2 stars