If the water from a WC fails to drain away easily or is overflowing, there is a blockage. Frequently this will be in the water trap in the pan itself and can readily be cleared. Bromley Plumbers can carry out all plumbing work. But, before proceeding, check the flow from other waste pipes to establish whether the blockage is affecting all the pipes. If it is, then the obstruction will be further down the line. If not, carry on as follows. Use a large plunger for this. Hold it so that the rubber end covers the waste outlet at the base of the pan and pump several times. Once the blockage is clear, the waste water should flow rapidly away its all downhill from here.How to rod out.If this wont clear it, the blockage could be further into the system, in which case, you can hire a large rodding auger to reach further along the pipework. This consists of a flexible rod which is pushed into the pipework. At the top is a handle that operates a claw at the far end. Push the auger down the pipe until it reaches the obstruction. Then turn the handle to dislodge it. If this fails to clear the blockage, it must be further along in the soil pipe. Unblocking a soil pipe.Old iron pipes rarely have serviceable access traps so the rodding out of such pipes may need to be undertaken via the vent, which is the top section on the roof. Access to the vent is high so if you are not confident you should use a professional like a Bromley Plumber .It is probably the case that a large mass of sewage is in the pipe above and this will come out at quite a speed. Unscrew it slowly and do your best to contain the result. If the pipework is indoors, lay plenty of plastic sheeting and make provision for clearing up the water. Remove the access cover and insert a drain auger (available from hire shops). Feed the auger in until you feel it reach the obstruction then turn the handle and move the auger back and forth to dislodge the blockage.?Withdraw the auger and flush the pipe with water from a hose. Replace the cover.