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Depósitos de agua potable 10 000 litros | #caixa d água cilíndrica 5000 litros

Depósitos de agua potable 10 000 litros

Depósitos de agua potable 10 000 litros

In this case only areas with probably the most unfavorable potential (anodes) are destroyed. While the areas of surface with the more positive potential (cathodes) don't show destruction.