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.
How Much Does the Average American Spend at Coffee Shops Each Week? A new report estimates that the average American worker spends nearly $14.40 a week on coffee, which does not include the cost of drinking coffee at home. Data is shown to indicate that the average worker spends around $1,100 annually on coffee. Not only are American's spending thousands on caffeine, but nearly half of U.S. workers say they are less productive without their daily cup of coffee.