Quote:
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?
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Actually, no. Most of the salt is passed out the motor through the exhaust: both the relief ports and the primary exhaust through the lower-unit hub. Most of the salt is in fact put back into the water you're recirculating.
However, that amount of salt is so small in relation to the 20-30 gallons of water in the barrel/drum, that it becomes insignificant as a corrosive.
It's all good.
__________________
Common Sense is learning from your mistakes. Wisdom is learning from the other guy's mistakes.
Fr. Frank says:
Jesus liked fishing, too. He even walked on water to get to the boat!
Currently without a SeaCraft 
(2) Pompano 12' fishing kayaks
'73 Cobia 18' prototype "Casting Skiff", 70hp Mercury