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hydro jet
A pump-jet, hydrojet, or water jet is a marine system that produces a jet of water for propulsion. The mechanical arrangement may be a ducted propeller (axial-flow pump), a centrifugal pump, or a mixed flow pump which is a combination of both centrifugal and axial designs. The design also incorporates an intake to provide water to the pump and a nozzle to direct the flow of water out of the pump.
Our plumber wants to do preemptive hydro jetting. Building was built in 1981 (41yrs old) with most of the larger (horizontal) sewer pipes in the garage already replaced and no current back ups reported in our 20 unit, 3 story building. I'm worried hydro jetting could do more harm than good...
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