To eliminate bitterness place a pinch (or two) of table salt in the pot before brewing. If the coffee has a salty taste, just cut back on the salt. It sure makes the coffee smoother and less bitter.
Now you’re giving away secrets..........1/8th. tsp. salt for 64 oz. of coffee from 1/2 C.finely ground (not expresso or Turkish grinds) beans.
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Not sure how to clean that up.....
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1/2C. fine grind coffee
1/8th. tsp salt on top the grounds
water to brew about 64 oz. brewed coffee.
I’m using auto drip usually, but yields as good a product from the press and Melita cone. Also makes the last of the pot almost as good as the first.