3.3. Small scale operational trial
Noticeable differences in the environmental conditions of the two
tank systems were evident after 14 days (see Fig. 2), with marked
differences at the end of the 100 day trial. The tank in which the rotary
cleaning device was in operation was considerably cleaner, the base of
whichwas free of pellets, faeces and discolouration (i.e. biofilmgrowth)