Timothy Murphy wrote:

stuart noble wrote:


If you suspect heavy pipe scaling pour a half gallon of brick acid down
it and wait a day till it stops fizzing.

Neither of which will have any effect on the typical household blockage
which, as in this case, is only partial. The chemicals will just flow past
it a little slower than normal.
Caustic unblockers are designed for people who pour things like cooking
oil down the loo. A lot of cellulose based products actually swell in
alkali. And scale sufficient to block a soil pipe? Jesus, that *would* be
hard water.


I've had two blockages in two different loos in the last 3 months,
both with slow dispersal.
Both were cleared with chemicals from the local hardware store -
the first was caustic soda, and the second was sulphuric acid.
Both had very clear instructions (wear goggles, etc) on the container.
They cost about 6 euro each.
The sulphuric acid seemed to work more quickly.

Incidentally, what is "brick acid"?
30% hydrochloric acid.