Cleaning galvanized water tanks - SailNet Community

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Old 08-11-2010
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Cleaning galvanized water tanks

Hello all,

I have a 1941 wooden boat with galvanized water tanks. The tanks were installed in the 80's and seem to have a growth or slime in them. They are not accessible for the most part and have no inspection ports, is there any good way to clean them? Most info I have found deals with plastic, aluminum and SS, not galvanized.

Thanks for the help and info!
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Old 08-12-2010
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fill them with a strong bleach +water solution and let this sit for a couple of hours then flush a couple of times
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Unfortunately, if the tanks have a heavy layer of slime on them, you'll need to clean them using either a strong acid, a strong base or physically scrubbing them. Bleach alone will only kill the surface layer of the slime, and it will continue growing as soon as the bleach is gone more likely than not.
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