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.
Known around the world for its wide variety of taste and stimulating nature, coffee is one of the most popular beverages on the planet, with 100 million daily drinkers in the United States alone. Billions of cups of coffee are drunk every day around the world; estimates put the total at 500 billion cups every year. When something is that universally celebrated and enjoyed, there must be something besides an energy boost and a well-blended flavor.