On 13/06/13 12:38, Martin wrote:

A comparison between drinking water in Reading which is taken from the
River Kennet and drinking water sampled in London after it has passed
through most of the population of the Thames Valley would be
interesting.

If the filters are OK and not working at a greater rate than their
capacity, I'd bet that their only difference would be in the proportions
of minerals.

There's not a lot that properly 'ripe' sand filter beds won't remove
from the water which passes through them.

I'd guess that you'd have to remove borax in some way.

--
Rusty Hinge