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.
One cup of coffee a day, which is about 8 ounces and has around 100 milligrams of caffeine, or two cups of black or green tea per day is OK, says David. View Article Sources. SOURCES: Obstetrics & Gynecology, August 2010; vol 116: pp 467-468. News release, American College of Obstetricians and Gynecologists.