The materials involved for the timer method for the aquaponic designs included in
this publication are as follows: a standpipe, 2.5 cm diameter, of a height of 23 cm that
has a secondary dripping hole, 6–12 mm diameter, 2.5 cm above the bottom; a media
guard, 11 cm diameter and 32 cm in height, encircling the standpipe to prevent media
from clogging it; and a timer that controls the pump that is calibrated based on the flow
rate of the pump and the drain rate of the standpipe.