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.
Experts recommend that you should limit your daily consumption to 200mg of caffeine a day. In coffee terms, this works out at about two cups of instant, or just one cup of filter coffee. This is assuming you are drinking from average sized coffee mugs, not the bucket-sized cups at your local coffee bar. The 200mg recommendation includes all of your caffeine sources, not just coffee.