No experience with Duplex ...

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No experience with Duplex 2304 :)     I question why you would select that material? The corrosion resistance is about the same as SS316L. 

You mentioned that you have brackish water. Beware of higher chloride levels if you are pumping for second / third stages. Temperature is also a consideration.

http://www.atlassteels.com.au/documents/Atlas%20Grade%20datasheet%202304%20rev%20May%202008.pdf