Arrived on site customer stated main line was backing up and had started to come up through floor drains. Gave pricing options customer accepted at this time. Ran drain cleaning equipment up to 65-70 feet and was able to clear blockage ran water to ensure no blockages would occur. Was able to camera line and record video of main line. At roughly 30 to 40 feet there is build up found on the sidewalls of the cast iron pipe, And at roughly 50 feet I was not able to get the camera past fitting. Customer is fully aware and was present when line was being inspected. Customer also took personal documentation for his records and is aware of issues. Thank you for choosing CPI Plumbing and Heating Inc.