Went to a house where there is a problem with the toilet in the bathroom constantly blocking up. The soil stack is in the corner of the room and the toilet about 5ft away with a 110mm soil pipe under the floor, in between the soil stack and the toilet is the basin which also drains in to the 110mm pipe. The customer says when the toilet blocks he runs the basin taps, air comes up in the toilet pan and then after a short while there is a 'whoosh' and everything clears. My theory is that soil pipe may not have a fall on it, maybe even a negative fall. The waste does not flush out of the pipe and builds up, when the basin tap runs it forces any air in the pipe back up through the toilet until the pipe is full and then the weight of water then forces everything down the soil stack and the blockage is clear for a while. Unfortunately the problem did not occur whilst I was there and so only have the customers description.
I need to go back and take up the bathroom floor to have a look but any other ideas to take with me would be appreciated.
I need to go back and take up the bathroom floor to have a look but any other ideas to take with me would be appreciated.