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I just opened 6 roof drains with the K-500. I was actually able to open the c/o on one of the lines and look into it. There is about 1/2" to 1" of build up on the walls of the pipe at the bend. Would a jetter be able to scour the tar off?
i would think you would have better luck with the jet getting under the tar than trying o blast through it.
the advantage of a root ranger is that it focuses all the power to a single jet and has a 0 degree impact blasting in a 25 degree pattern. if anything can get under it this will. i know the nozzle is identical to what use for a forward cleaning nozzle and it will cut a 2x4 in half in seconds.
the rocks should blast off and expose the tar. a cold over pour will be easier than a hot pour that's bonded.
the nozzle can be removed from the front head and used as a straight forward nozzle. a pressure washer wand is the safe way to do it.
or a heavy hydraulic hose with a stiffener to keep it from turning back.