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Cleaning with cutters and knockers is about evaluating each situation and knowing your equipment well. Inspecting or precleaning the line with a standard nozzle before using the cutter can help prevent problems.
The last thing you want from a tool designed to fix problems is for it to create new ones. Unless you take the time to knowledgably choose and operate the right chain knocker or chain cutter for your next pipe cleaning job, that could be exactly what happens.
When used correctly...
