Originally Posted by
COpltASgldPHX
As far as salt, SixAlpha, never heard of that and quite frankly - eeewww!

My grandfather used to put an eggshell from the previous day's breakfast into his percolator and swore it took the bitterness away but of course back then the salmonella police wouldn't visit your house for doing something like that.
I remember during my previous career in the (US Army) Infantry that adding salt to coffee DID improve the taste but then we took out the old socks before brewing.
In over 30 years of travel I have yet been able to replicate the restaurant flavor of coffee and I tried many variations - more or less beans, burr and blade grinder, more or less water, different coffee pots (should have taken out stock).