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.
How much caffeine is too much? The U.S. Food and Drug Administration (FDA) and the International Food Information Council recommend healthy adults have no more than 400 milligrams of caffeine a day, which is about four cups of (regular) brewed coffee. Kristafor says one of his 12-ounce cups could add up to 702 mg of caffeine. So, yeah, thatâs a lot.