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Old 22-07-2020, 06:25   #16
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Re: air conditioner discharge splash

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Originally Posted by sailormed View Post
At the risk of thread deviation I have to admit that our boat has the same stupid installation. The seawater outlet of the AC is about 2,5 feet above the water. So I intend to lower the thruhull to about 1-2 inch above the water line (and keeping the high loop in the hose). But the years of splashing seawater have left their trace in the form of a crust of salt on the gelcoat.
How do I remove this? Seasalt is pretty resistant to all solvents, acids, etc. Any one has a solution?
An acid, likely Mary Kateís on and off will work.
Itís not salt, itís I believe calcium carbonate.
Donít get it on you, it will burn, but itís specifically made to clean hulls, I have always used it to remove ďtea stainsĒ you get on the bow from tannic water.
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Old 22-07-2020, 06:31   #17
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Re: air conditioner discharge splash

Thanks for your suggestion. I will give acid a try (HCl) first to see if there is a reaction, but I am afraid it is pure NaCl, it looks like white salt on the hull.
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