I'm so excited to get the media into the bins today! The two black tubs are my biofilters, which will accept the water directly from the fish tank. One is filled with 3 bags of black cinder and the other is filled with a 50-liter bag of hydroton. It could probably use another 10 liters tho'. Before filling the tubs, I sifted the black cinder with a screen of 0.25 inch hardware cloth and washed it. I just washed the hydroton. So, generally, my setup operates in two integrated parts, in theory:
Part I, Ebb and Flow: Water runs from fish tank via 500 GPH water pump => 2 biofilter grow beds => through bell siphon (CTAHR-style) => sump => overflow returns to fish tank.
Part II: Continuous Flow: Water runs from sump via 250 GPH water pump => 2 white floating rafts grow beds => overflow from grow beds returns to sump => overflow from sump returns to fish tank. Note: the fish tank is not shown. It's located in the slightly sunken basement, behind the brown laths of the house.
Goodness, I really hope this works.