Mary Pegg wrote in news:Z6x7e.806
:

Mary Pegg wrote:

[fx: thinks] So the water is meant to travel around the rim and *then*
enter the bowl? So the problem lies at the front?

Golly! A Flash animation that's actually useful! See he
http://home.howstuffworks.com/toilet1.htm

I'm experimenting at the moment with dosing my cistern with small metered
amounts of spirits of salt (hydrochloric acid), on each flush

The concentration is extremely low, and I think, not harmful; time will
tell.

It appears to be working, the limescale I removed has not yet reformed - I
left a bit of scale on, but it hasn't disappeared - yet?

mike