Hi, to make a long story short, the plumber found that calcium has been building up in the last segment of pipes near to septic, reason is the water conditioner line is tied into the bigger pipe, the plummer put his camera down and that's what he saw, and son in law noted when he put the hose in with force etc, it was breaking it up. But bottom line is, short of digging up the pipes which is not a reality in this case, WHAT CAN HE USE TO DISOLVE THE CALCIUM. Thank you