To clear a clogged sewer line, a nozzle with a forward jet is used. Forward jet only use a small proportion of the total GPM to bore through a blockage with a minimal loss of propulsion. The forward jet is design to bore into the blockage to allow the rear jets with more flow to remove the bulk or remainder of the blockage. Note that a forward jet may have reduced flow per orifice compared to the rear nozzle orifices; the pressure is always the same at all orifices.
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