If you're having to add salt to your coffee to cut bitterness than you're making the coffee wrong.
So that I don't have to bang on my keyboard like a raped ape, simply Google: "what causes coffee bitterness", then read the info and start making adjustments to the way you make your coffee so you can eliminate the bitterness without having to use salt.
I make all kinds of different coffee using all kinds of different coffee makers, from a French press, to Bialetti Brikka Moka Pot, copper Turkish coffee pot, AeroPress, Hario V60 Switch, Kalitta Wave Stainless steel pour over, Vietnamese Phin, OXO Good Grips cold coffee brewer, Cafelat Robot, and I never get bitterness after a little practice using a new maker. The only coffee I have trouble making is cowboy style, I could never get it right, and after many tries, and wasting a lot of coffee I gave up on it, it was always bitter.
One of the coffee makers I listed I no longer use, the AeroPress was a huge let down with the promise it would provide and espresso type of coffee, not even close, it was much closer to a French Press, and in fact the maker is almost identical. It's not that the AeroPress makes bad coffee, I just think the French Press does it better because it leaves the oil in the coffee.
