When the WC pan is flushed the water level should remain
the same level. If the level rises and is slow to clear
there is probably a partial blockage near the trap. Fill
a bucket (or a bedroom bin) with water and empty into the
pan, throwing it down as quickly as possible. Try this two
or three times if necessary as this action will often clear
the blockage.
If the blockage remains use a plunger. A Cooper's plunger
is the correct tool to use because it is a plain rubber
disc - never use a plunger with a metal disc as it could
damage the pan. If you do not have a plunger try using a
household mop or toilet brush wrapped in some old rags to
increase the diameter of the 'plunger' and then cover the
end with a black plastic bag tied at the top.If the water
level in the pan is high, use a container to bale out some
of the water first or use a length of hose to siphon off
the water. (Fill the length of hose with water and use your
thumbs to seal both ends. Have a bucket ready next to the
WC, then place one end of the hose under the water in the
pan and the other end to a lower point in the bucket. The
water will now run freely into the bucket). Insert the plunger
in the pan and move it firmly up and down vigorously.
If this method fails try use a chemical drain cleaner or
caustic soda, but you must follow the instructions carefully.
However this method will take a long time to clear.
If this method fails try using a WC auger. Push the flexible
clearing rod into the trap as far as possible. When the
obstruction is found, the cranked handle at the other end
is clamped and turned. Next either push or pull the rotating
head when the blockage is engaged and then dislodge. Flush
the pan and disinfect to clear any debris. Clean and disinfect
the auger thoroughly.