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.
Caffeine is classified by the Food and Drug Administration as âgenerally recognized as safeâ (GRAS). Toxic doses are usually considered anything over 10 grams per day for an adult. To put that into context, one cup of coffee contains 80â175 milligrams of caffeine depending on the bean and preparation method. So someone would need to have roughly 50â100 ordinary cups of coffee to reach a lethal dose and have a true caffeine overdose.