It depends on what you mean by efficient. Using the least amount of water possible? Yes. Very efficient. How about cooling as fast as possible? No. Not very.
There's a sweet spot between how much water you use vs. how much time it takes to chill and I think 3/8" is a pretty good middle ground. 1/2" is even better if you don't mind using more water for the fastest possible chill down.
1/4" is nice if you split the flow into three separate paths, but it's a slightly more complicated build.
Sightglass, Refractometer, Ball Valve, Weldless bulkhead, Thermometer, Decals, Stainless Steel Fittings, Compression Fittings, Camlock Quick Disconnects, Scale, RIMS tube, Plate Chiller, Chugger Pump, Super Clear Silicone Tubing, and more!New Stuff?