In particular, stainless steel types 304 and 316 have been very successfully used in a range of water and waste treatment systems. Thus, they have a low maintenance requirement throughout their long service life. One does not require any chemical additive in order to maintain corrosion resistance. Furthermore, aeration processes do not lead to rates of higher corrosion which may be the case with carbon steel. Corrosion in waters normally occurs in crevices where there is a fold or join in a panel. However, crevice corrosion is rare in stainless steel and type 304L and 316L. Chloride levels are under two-hundred parts per million and one-thousand parts per million there. Best practice dictates that crevices are best avoided in the design and fabrication of such plants. Another advantage of stainless steel is that metal leaching rates are also minimal. Using low carbon grades (304L and 316L) when welding and removing surface contamination and heat tint is also good practice when dealing with wastewater plants. Stainless steel 316L contains molybdenum at two percent allowing the stainless steel to resist corrosion from chlorides such as seawater.

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