Having read all the previous very useful advice in Forum on fosses and possible alternatives,can anyone advise on how they deal with percolation if the garden has fairly high granite?? I think maybe I need to start addressing soon in view of new regs -we are in 22 in very rural area so I don't think it will be mains drainage for us and I'm not sur ethat whatever fosse exists at the moment is likely to conform to anything. Thanks Jan