In that case maintaining the correct temperature is going to be your issue.
The solution is filter coffee.
The precipitate is coffee grounds...
Not if you store the compressed air somewhere, then add your hot water and then release the air at once.
Why not use your inner tube/wheel as the compressed air storage tank? Can't imagine that'll affect the taste at all.
@mmccarthy started
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In that case maintaining the correct temperature is going to be your issue.
The solution is filter coffee.
The precipitate is coffee grounds...