Pond Boss Forums POND CONSTRUCTION Renovating a Pond or Lake? Clogged Drain Pipe

I would run a straight nozzle power washer up from the outlet. The end that the hose attaches to the gun can come apart. Take the end off the gun that changes out the tips and put it directly on the line. Add the straight nozzle or a roto nozzle and feed it in. With the line pressurized I should not turn around on you. The roto nozzle will cut up wood easy.

That is what I would do if it was me.