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I fear that the steel industry may have a long search for an alloy resistant to accelerated low water corrosion (NCE 4 June). Peter Howsam of Silsoe College pointed out in your letters column a few weeks ago that the problem is identical to biofouling and biocorrosion in water supply wells. The essential features are the same: an aerobic/anaerobic interface; water flow to provide nutrients; orange layer over a black anaerobic layer.