Allan writes, The purpose of the filter course is to prevent fine soil medium particles from washing into the drainage layer causing clogging or reduction of the drainage capacity of the drainage layer.
Just how much caffeine is too much? For the average person, up to 300 mg of coffee a day, or two to four cups of the average brewed coffee, is a moderate amount that isn't harmful. But once you hit more than four cups, you may experience less-than-desirable side effects.
Which is worse - the Sugar or the Caffeine? I drink, on average, three cups of coffee a day. Usually this is stuff I brew up at work, and I make it almost twice as strong as most people. My coffee cup is just a standard coffee cup. Not sure how much it holds, probably about 8-10 ounces.