Brad,
After I shut off my return to do a water change, the water level is below the return outlet. A soft start allows some water to enter the display slowly first, whereas my old pump caused a firehose effect which splashed water everywhere (on the underside of my glass tops for instance) and freaked out the fish. Also, I like to dial down my return so having that feature is perfect for my application. I run mine at about 80%, but can run it up to 100% or slow it down if I change my mind. I like having that controllability.
Anthony
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