Fine or Coarse Ground Coffee what to use

Canada
@suspenseful (40382)
September 19, 2009 10:44am CST
I use Tim Horton's coffee for my Melitta coffee maker, not the electric kind, but the manual glass carafe with the coned filter. What happens is I boil the water, and then put the boiled water into the carafe. Now I have been using the find grind, but I found after the first two tries (it takes three fills to fill up the carafe, the water goes through ever so slowly. So I was wondering whether like in the old perculators, that perhaps I should switch to the coarse grind? Your opinion please.