What are your thoughts gents about the pitting and crevice resistance of the cheaper 5A and 6A (CE3MN, CD3MWCuN) Duplex vs. the AL6XN, 254SMO (CN3MN,CK3MCuN).It is for pumps and valves in a desalination plant. So I asume seawater. The PRN or CPT in the literature is fairly similar especially if...