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Old 08-05-2012, 08:30 AM
Duekster Duekster is offline
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Join Date: Jan 2007
Location: DFW, TX
Posts: 7,971
If you did use the galvanized steel grate and cut it then you have broken the cathodic barrier.

Secondly, depending on the pH of the water, the galvaized material may not passivate correctly and form white rust. This is in addition to the corrosion concerns where the grate was cut. You could go back and apply a cold zinc coating but it is not as good as the hot dipped galvanized coating.
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