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.
According to the recent U.S. Dietary Guidelines, 400 milligrams of caffeine a day can be part of a healthy diet for most adults. Thatâs two to four eight-ounce cups of most coffees. The Food and Drug Administration says 600 milligrams a day is too much. An eight-ounce cup of Death Wish has 472 milligrams. And for many people a âcupâ of coffee ranges from 12 to 20 ounces. (The table below lists the caffeine content of different products per fluid ounce and per serving size.)