Filtration
is sort of an all-encompassing category that covers things that take
out of your tank all of the stuff that you put in, other than animals
that is. Not only will animal waste products quickly cause toxic levels
of ammonia in the system, but dissolved organics can quickly overcome
a closed system, and must be removed. There are three basic types of
filtration: biological, mechanical, and chemical. Each of these three
types of filtration fill particular niches, and most or all are necessary
at some point. All of these types of filtration will be discussed in
the following sections:
