Anyone use a Mag 12 or 18 with a SCWD? Is the 18 too much flow for the SCWD to handle? I have a SCWD set up now with a Quiet One 4000 HD and the flow is a little sluggish. The plumbing is as follows: Pump, to union coupling, to SCWD, to 90 degree bend, to swing check valve, to 90 degree bend...