This is the new filtration on the first big round tank on the right as you come into the first polytunnel. We no longer have the trickle tower, large biological chamber and settlement chambers that we had before.
The tanks are all different sizes and make the best use of the space available.
The wooden construction of these small tanks is the same as we used for our spawning tanks. We used the spawning tanks as holding tanks for small fish last year to great effect and so decided that we may as well do the same thing with these new tanks.