Flushing motor in a barrel - any cons?

[McGillicuddy]

Come on Steve, I know a thing or to about pissin' into wind - I do that atop Mt Whitney just to stay warm at night Nonetheless point taken. But really, the salt residue is going out the pisser hole and will land outside the barrel; and even if a little splashes in the salt will be so diluted by the incoming fresh water that the salt is but a trace, no?