Saltwater Aquariums

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ETS's Down-Draft Skimming
 

Also known as Down-Draft skimmers, these models use a long tube connected to a sump with nothing more than an internal baffle plate and a drain valve. Inside the long vertical tube, bioballs are placed to diffuse the high velocity water that is injected at it's top. As the water shoots down over the bioballs, it is smashed and resmashed on the tower of bioballs. By the time the water reaches the sump at it's base, the water is a white sea of foam. The baffle inside the sump creates dwell time and allows the protein-rich froth to rise up into a wide-mouthed tube with the collection cup mounted above it. These designs can process huge volumes of water and are favored by big tank owners.

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