Once removed, if the manhole is clear, the blockage is between
the manhole and the house. The only effective tools for
this job are a set of drain rods because they are flexible,
unlike a stick.
Sometimes a small blockage could be cleared
by plunging with a mop or use of a stick, but the outlets
and inlets are hidden by effluent and flexible rods are
Screw two rods together and slide them
into the chamber in the direction of the suspected blockage.
Screw on another rod and continue pushing, whilst manoeuvring
the rods vigorously back and forth. Always turn the rods
in a clockwise direction as you push them, this will stop
the rod loosening or a joint undoing whilst underground.
Continue until you feel the blockage clear.
The chamber should then be flushed thoroughly to remove all traces of
debris. Sometimes the blockage is caused by a build up of
fat in the chamber. Flush hot soapy water through the chamber
to help remove any remaining debris.
If the blockage cannot be located, it must be further down
the run. Lift the next manhole cover and repeat the process.
If the lowest manhole is blocked, then the blockage must
be between that manhole and the sewer. If it is an interceptor
trap, the blockages are nearly always in the trap.
The trap is usually full of effluent, some stoppers are on a chain
otherwise feel for the handle with a stick and try to hook
it out of its socket. Try not to let the stopper fall and
block the trap. Use the rods through to the sewer and then
flush out the channel with running water to clear debris.
Replace the stopper and before replacing the cover smear
a little grease around the frame to stop any rust in the