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I had a rash of urinals last week,most Am.Stand. with these tiny trap ways.
I run the 1/4" cable through them then follow up with the Santeen.
It is produced in Hopkins MN (SW side of the cities,here) and they distribute to mostly
usually by the time they call the plumber the trap is almost if not completely sealed. Too much for CLR to break down quickly. The other products mentioned are much much stronger and can dissolve the build up in a half hour or so.