Wow, this started quite the discussion!

So, thanks for the suggestions. It seems that the problem was caused
by a rubber valve part (basically a little rubber pad which the
mechanism pushed against a small nozzle to stop water flow) which had
deteriorated. I ended up replacing the whole fill valve assembly
anyway. It works now.

There does seem to be some slimy grit in the water which gets slowly
deposited on all the surfaces in the tank, so that may be the culprit.
Also, it seems that the water pressure is very high. I tried to
compensate by partially closing the shut-off valve and that seems to
help.

Sean


On Mon, Mar 24, 2008 at 9:57 PM, Apptech <apptech@paradise.net.nz> wrote:
> >> There is very little EE stuff in a toilet!
>
>  > Note: here on the piclist the EE tag stands for everything
>  > engineering
>  > not electrical engineering so problems with toilet
>  > mechanisms do just
>  > about fit under the EE tag.
>
>  Challenge:     Just try and make a toilet cistern with
>  existing functionality without any engineering.
>
>  ie Every piece of functionality present is engineering
>  based.
>  You MAY be able to persuade one to grow as a biological
>  object - using "only" bio engineering :-).
>
>
>         Russell
>
>
>
>  --
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