Contractor washed concrete down a 4" PVC drain pipe. It does slightly flow water, like a trickle from a soda bottle. Pipe will fill until submerged with water., then slowly drain. I have snaked using a hand held powered snake. I can get past the concrete, but cannot release any more solidified material. Some pieces removed are curved like the bottom of the pipe. I have read muriatic (hydrochloric) acid will soften the concrete. I am concerned of the chemical reaction causing heat and destroying the PVC pipe. The drain is under patterned concrete around a pool. I am holding contractor payment of ~ 5%. Contractor refuses to address until fully paid.
Any experience using muriatic acid to soften concrete? Any safety concerns?
Any experience using muriatic acid to soften concrete? Any safety concerns?