Lew Hodgett wrote:
Somebody wrote:

Did I read that correctly...urine will destroy an aluminum holding
tank?

Yep. It'll destroy ANY metal holding tank, even 316 stainless.

That's why "tank resin" exists.

Metal tank mfrs have have been coating holding tanks with all kinds of
things...epoxy, resin... To date there has been nothing that will
extend the life of a metal holding more than a year or two...if that long.

--
Peggie
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Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://shop.sailboatowners.com/boat_odors/