My understanding on restricting flow on a Mag pump is to use a T fitting with a ball valve to diverting the flow back into your sump. This way you are not creating any back pressure on the pump which can be hard on them. I found this image to help explain.
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Nick
"Life is like a piece of live rock, you never know what you're gonna get inside....."
Current Tank Info: Innovative Marine Nuvo Fusion 40 - Fully Automated with Aquatronica Touch Controller
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