After quite a bit of frustration trying to get two different SCWDs to work on one of our return lines, we discovered that the 1″ unit does not switch direction when confronted with the back pressure produced by adding a penductor on the outlets. Apparently, the pressure causes the internal “valve” to press against one of the outlets, preventing the mechanism inside from rotating to redirect the water flow. Now we know aquarists who have used eductors on smaller SCWD models but the compatibility of the SCWD and flow multiplying devices is probably also dependent on the type of pump used, whether it is flow or pressure rated, yadi ya. This incompatibility certainly puts a damper on our future return line and closed loop plans, a note has been sent off to the manufacturer 3iQ Ventures for comment or sugestions regarding some possible solutions.
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