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 National Coffee Association of Americaâs National Coffee Drinking Trends study, 61% of Americans over 18 now drink coffee daily; that is nearly 200m people. The Specialty Coffee Association of America estimates that the US coffee market is now worth between $30bn and $32bn dollars. Thatâs a huge prize.