Copper and aluminum are both used as piping and pressure vessels. The water isn't going to hurt them. If the water is pure, or you add some corrosion inhibitor (auto parts store), the thing will live for decades. If the water is salty or not neutral in pH, your mileage may vary. In any case, the aluminum is going to sacrifice itself, so the copper tubing will survive.
The kids who built some of the units in the pictures I posted are now out of college. They have become homeowners and parents, and their hacked air conditioners remain. Most now live as relics in the museum (garage or attic), BUT SOME ARE STILL OPERATING AFTER 20 YEARS.
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