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Just one more question for this week. I removed my water tank from the boat so that I could clean and paint under it. The tank sits on a wooden supports. When I inspected the tank I found it badly corroded and full of holes on the bottom. The tank is made from aluminum and has a ground wire attached to it. Any ideas as to why it would be full of holes. I'm planning on having one made out of stainless steel. Will that also corrode.
 

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Aluminum tank - normal chlorine in your water corroded the tank. You also probably found a lot of 'white sand' (aluminum chloridte) in the bottom. Aluminum makes LOUSEY water tanks because of the attack by chlorine.

Stainless steel tanks should have a minimum of welds, the welds ground smooth, .... then the tank should be passivated. Stainless 316 is the material of choice for water tanks. Polished stainless (internals) is best.
 
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