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.
The recommended dosage for Perfect Green Coffee is 1 capsule 3 times per day up to a maximum of 4 capsules per day. Each capsule is 400 mg. See here http://healthfoodpost.com/green-coffee-extract/green-coffee-bean-dosage/ Perfect Green Coffee has 50% chlorogenic acid.