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.
A safe range for daily caffeine intake is between 200 to 300 milligrams for healthy adults. This is equal to approximately two to four cups of brewed coffee. No specific amount of caffeine per day can be recommended, as every individual reacts differently to the effects of caffeine.