Wait, what's the point of having the copper slug transfer to the aluminum and then to the water? Why not just make the whole thing aluminum?
There are several blocks that are copper and aluminum in order to save money. But really the all-copper ones aren't that much more expensive and generally perform better.
Now, I don't see how incorporating silver would reduce cost... some people have made blocks out of silver coins and I remember there was a plexiglass silver block on the market a while ago but they don't at all perform in accordance with their price.
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