1. components of the deep water culture aquaponic unit (dwc) 1.1 water flow in the deep water culture unit described in this technology, water flows by gravity from the fish tank, through the mechanical filter, and into the combination biofilter/sump. from the sump, the water is pumped in two directions through a (y) connector and valves. some water is pumped directly back to the fish tank.. Deep water culture aquaponics. chapter 6. now, let’s look at the basics of deep water culture (dwc), which is also commonly called raft culture or cultivation. put simply, build a big tank, trench or pond and float some lightweight foam or styrofoam rafts on it. design your trench dimensions around those rafts; leaving at least one inch.
