I made a chiller out of a water cooler. Took the guts out of the tank to put a 15' coil of 3/8" tubing that runs off a small fountain pump in my tub to circulate the nutes up and back. Worked so well that I had to put a timer on the cooler so 15min on 45 off. Need to cover the exposed tubing to block light or algae grows inside it. The cooler tank is filled with auto anti-freeze for better heat transfer and cut evaporation.
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Mosquito screening hot-glued over the pump intake to keep roots out. The pump runs 24/7
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It could easily chill a larger rez or at least a couple of those tubs that hold 50L each.
