Note: This guide assumes you are using the standard DC variable speed version of this popular reef aquarium skimmer. If your specific model has an AC (non-variable) pump, skip the controller instructions. 1. Product Overview The NKD-315 is a compact, in-sump protein skimmer designed for marine (saltwater) aquariums. It utilizes a DC (Direct Current) needle-wheel pump to efficiently remove organic waste (proteins) from the water column before they break down into nitrates and phosphates. F1 2012-flt Realistic Gameplay And