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.
Is it bad for us or not? How much is too much? And how, exactly, does caffeine interfere with sleep? In terms of how much caffeine you should have, the general consensus is that up to 500 milligrams per dayâor roughly the equivalent of four eight-ounce cups of brewed coffeeâis safe for adults. Children, on the other hand, should have no more than 100 milligrams of caffeine a day. Drinking more than the recommended amount of caffeine per day can cause adverse side effects, many of which interfere with proper sleep cycles.