The main tank cycling is powered by a single Sequence Reeflo Dart. Accounting for head loss, it is pumping just under 3,000 gallons per hour through the tank. There are three 2" drains that flow into the sump. Each drain has a Durso silencer on the inlet and another silencer on the outlets (into the sump). The large amount of return flow coupled with the silencers brings the noise to a very quiet level.
The acrylic sump measures 40" long, 20" wide and 16" high for a total capacity of approximately 55 gallons. In normal operation, it's about half full. This leaves enough room for the tank to stabilize without overflowing in the event of a power outage.
The sump return is split into two 1.5" return lines pointing down the long length of the tank. Inside the tank are two Tunze 6100 Stream Turbelles on the opposite end of the tank from the sump returns. The 6100s are powered by a Tunze 7095 controller (for those that care, the controller is set on Interval 2).