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.
they concluded that strong evidence shows moderate coffee consumption 3 to 5 eight ounce cups per day or up to 400 milligram day caffeine isn t tied to any long term dangers for healthy people now the word healthy is key read on for more and this is a general statement not a directive