Media beds can be made from plastic, fibreglass
or a wooden frame with water-tight rubber or
polyethylene sheeting on the base and inside
the walls. The most popular “do-it-yourself”
(DIY) media beds are made from plastic
containers, modified IBCs or even old bathtubs
(Figure 4.51). It is possible to use all of the above
as beds and other kinds of tanks so long as they
meet these following requirements: