In article <541j0s$s37 at boursy.news.erols.com>, gunz at mail.erols.com says...
>>Never use demineralised water or water teated by reverse osmosis for
>brewing, there are tons of minerals in good water that you can't get from
>hops or barley. Any good tasting beer starts with GREAT tasting water!
..and many consider Guinness from the Liffey to be a prime example.