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.
Mmm, coffee... almost everybody drinks it... some people have 3-4 cups per day or more. But most people don't think of it as a health drink. And it's certainly NOT healthy the way most people make it with loads of added sugar or artificial sweeteners and artificial creamers.