The water block is the biggest restriction in the entire system. I did not check flow through my new D-Tek TC-4, but I did with my Gemini High Volume block.
At a 12” rise or head my Eheim 1250 pump would deliver 190 gallons per hour. With the Gemini water block attached the pump would deliver 64 gallons per hour. Next was to place the heater core inline. The flow dropped to 60 gallons per hour.
Now with the TC-4 the channels are closer to being 3/8” than the Gemini. This is where I can contribute why my temps dropped 2c over the Gemini. Next was to bring the entire system to match the 3/8” ID / 1/2 OD barbs and why my system now wears 3/8” tubing.
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