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.
Coffee Consumption. Coffee is the most popular drink worldwide with around two billion cups consumed every day. In the UK, we drink approximately 55 million cups of coffee per day1,2. 80% of UK households buy instant coffee for in-home consumption, particularly those aged 65 and older3.