Circulation

The main return pump is a mag drive 18. Water circulation is acomplished by using 2 SCWD's (Pronounced Squid's). The main return pump is split into three feeds. one feed  sends water to the refugium. A slow flow to the refguim is controlled by a ball valve. The two other feeds run to the SCWD's. Each SCWD splits the feed into two lines and alternates the flow of water back and forth between each line.

What is SCWD?
SCWD is a water switching or current generating device. SCWD switches or alternates water in two or more directions, depending on set up. It is an excellent water current generator for both salt water and fresh water environments, whether tank or pond. SCWD also has garden applications. It may be installed in statuary to create alternating or switching water flow from one spout or outlet to another or create decorative displays in garden ponds. The patent-pending device, which requires no electricity, directs water between two outlet ports at varying intervals. The higher the volume of water flowing through the SCWD, the faster the switching response.

The first SCWD feeds the built in return lines that flow up through the overflow's. Each return line from this SCWD has two outlets. One up near the surface and one down near the sand bed.

The second SCWD also has two outlets on each return line. The return lines run from the SCWD up the back of the aquarium down the center of the tank then around the front all the way to the back. The first outlet on each of the 2 return lines is located at the front of the aquarium half way between the center post and the side. This return is a 3 inch link loc nossle. The second return is located at the center of each side. This is a standard link lock nozzle.

Mag Drive 18 pump The main return pump is rated at 1800 gph. The actual flow rate is considarably less as a result of head preasure.	SCWD Switching current water device mouted to stand. One SCWD is mounted on each side front and back.	HYDOR rotating Water Deflector	Return Lines One SCWD is conected to the two rear return lines the other SCWD is conected to the returns located on the left and right side. The two FLO rotating deflectors are located at the front.