Returned to jet the kitchen sewer line due to severe grease clogs and I was unsuccessful using a flex shaft. Removed the kitchen drain line and added a temporary sanitary tee to jet thru and wasted water fell inside a bucket. Covered the floor with the blue protective plastic cover and ran the jetter for a few hours to clear the line. After several attempts I managed to clear the sewer line of hard grease and ran the camera and found that most of the sewer pipe including the main line are back pitched and need to be repiped to have a proper pitch and support to prevent sags in the line. Homeowner was informed that due to the severe back pitched there is NO WARRANTY for jetting the line. I did clear the sewer line where they have a working drain but It is only a temporary relief and eventually the line will clog up again.