[markello]

Cast iron pipi from septic tank to collection tank plagged shut with hard as a rock black deposit. I cut 6' plagged pipe, but pressure washer could not cut through remaining one foot pipe to the tank

[ballengerb1]

Can you take another shot are describing the issue? The septic tank is the collection tank. Did you mean a distribution box or between the house and the tank? In any case it is not likely that you canclean this out with a pressure washer. Use a sewer auhger with a 2" or large cutter, rent an electric auger, this is not a small job. Drop down to the bottom of this link Sewer Product Rentals - Sewer Augers - Rooters - Columbus, Georgia I'd suggest the 3/4" 75' auger for a septci cast drain line.