Well the easiest way to get water in the chamber is either to tee off your return or main Herbie drain. To avoid stealing flow from the return I'd probably go with the drain. A reducing tee installed some where before the gate valve running 1/2" line to the new chamber. 1/2" ball valve for control and you're done. You'll have set the chamber flow rate first with the ball valve then adjust the gate valve after. I can't tell if any mods are needed to get water out of the chamber or if it will just overflow into the rest of the sump as is.
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