You need to put a mixer of some type in that tub, and I don't think a little submersible aquarium pump is going to do it. I've got a similar cooler here (that I haven't had time to build into a computer yet) that actually uses ice to cool the water (I don't think you have any evaporator left un-frozen, so really you are using ice to cool the water too, and the chiller to make the ice). Anways - the device I have has the evaporator in a bucket with a prop at the very bottom, and a long shaft running up out of the top to where a motor is mounted centered over it all - think of a ceiling fan in a house but with the fan on a long axle and hovering just over the floor - it mixes up the contents and I can actually get water (yes, just water, no antifreeze or anything) at a few degrees below freezing - same thing as when the center of the river doesn't freeze in winter, fast moving water can stay liquid a few degrees longer. I think if you can find a strong enough stir-er you should be able to get at least another 5 degrees out of the water-temp (assuming you measure temp at some random unfrozen spot, not put the thermometer right on the block of ice)
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