I restrict the output on my mag12 and it gets quieter. You can search my username for the question that I asked.
I used 1" return lines on my 75g, as this was more than enough using the Headloss Calculator. The issue I was having was when the ball valve was wide open, it sounded like the pump was cavitating, even though it is completely submersed in the water.
I couldn't figure it out and it was weird that on my 50g, using 3/4" return lines, it is wide open without any noise.
Turns out, without enough head pressure, the pump will be noisy. I turned the gate valve back to about 75% now, restricting the flow, and the pump is basically dead silent.
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120g, 50g Sump, SRO XP2000i, MP40W x2, DIY Hybrid LED/T5 Fixture, Apex
PBMAS VP 2010-11
PBMAS 2017 President
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