So I have a plate chiller which works pretty nicely. Brings the temps down to within a few degrees of groundwater temps. Problem is that during the summer the ground water temps are 72F+. I don't want to pitch at 76F. I already have an old 25' 3/8'' IC, which I'm thinking of making into a pre-chiller. Shouldn't be hard, just need to buy some fittings and bit of tubing. In an ice bath at say 34F, how much drop in water temp do you think i'll get by the time I exit the IC? Obviously depends on flow rate, but take a guess. If I can drop it 10-15F or so that would be fine and any more will just mean less water used.
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