Phil.
>
> Phil's note about Canberra tap water is interesting as it is similar to a
> problem I have with my 105000 litre concrete water tank (10 years old).
The
> pH is often off the scale but the hardness is actually very low so as soon
> as I put the water into an aquarium, the substrate easily "resets" the pH
to
> a more midrange level (within a couple of minutes). No need to use any
> bottle products. I wonder if they use concrete water pipes around
Canberra?