My friends have a floor drain in their concrete basement. Two weeping tile pipes also run into this drain. The drain plugged the other day. It was plugged solid with what appeared to be a mixture of very fine sand, silt, rust particles and soft "muck". I removed approximately 8 vertical inches of this material before hitting the bottom of the trap. Starting at the bottom of the trap and proceeding down stream, this above material has turned into an incredibly hard "concrete". We managed to chip through the center of this with a nail but can only open up a hole with a diameter of approximately 1/4 inch. We tried snakes and chipping at it more with a steel punch but neither made even a dent in this "concrete" material. Does anyone have any idea how to loosen this material or break it apart? The pipes are two inch cast iron and are approximately 35 years old. My guess is the drain has never been cleaned.
Any suggestions would be appreciated.
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