It depends on the selection of coffee beans you take to percolate coffee, creating a difference in flavour. If you want a dark roast or acidic taste and a strengthful brew, the coffee will take much more time than the ordinary flavour.
For low-acidity coffee, you should buy the light roast or soft and smooth-tagged beans. Either take coarse-grind beans or grind yourself with a grinder so they can't go to the basket while making coffee.