I picked up a Jebao 20000 pump which should give enough turnover to my sump and is adjustable as well. Going the route of using my Vectra M1 as a recirculating pump in the DT. Between the two I should have plenty of flow using less energy than my current setup that uses a Barracuuda pump in the basement. The new setup will accommodate the Barracuuda or Hammerhead if needed.
This will leave me with one overflow instead of two. The Reef Synergy overflow is rated from 400 to 2500gph each. I currently have the Barracuuda running unthrottled, which should be around 2800 gph at 12 ft of head, so I am likely exceeding the rated flow for the overflow a little atm without issue. For reference, at one time I was running the Hammerhead unthrottled with two of these overflows. The only reason I changed the impeller was to reduce energy use. That would have been around 4,500 gph at 12 ft through two overflows.
The Jebao is rated around 3500 gph max at 12 ft of head, so I will dial it back considerably. I have not researched the amount it can be dialed down, but an older and smaller one I had would go as little as 35% if I remember right. I am sure at 12 ft of head the flow reduction is not a direct percentage matching the pump setting, but I am guessing it to be close enough to gauge for my needs. I am targeting around 1150 gph through my sump, the capacity of one of my sea swirls. If I cannot dial it back enough, I will add a couple of small lock line jets pointing down the back of the tank behind the rock to bleed off some of the flow.
Nothing really new here, just documenting my rebuild. If anyone sees major flaws in my plans, please speak up, all input is appreciated!