Stainless filter screens

[Treebeard]

Thanks for the explanation. I will drop that idea.

Originally Posted by sphelps

All stainless steel can corrode, it resists corrosion because of the chromium alloying agent which reacts with oxygen to form a film of chromium oxide which protects the internal steel. However oxygen is required, you'll notice many stainless steel parts will show signs of corrosion over time in areas of contact with other surfaces. For example your stainless steel coral shears corrode around the pin first and spread outward. Also your kitchen knifes corrode in the dishwasher if you put them on the rack (the rack stays in contact with the knife surface preventing oxygen to react with the chromium in those areas).

So in short no stainless steel should be used long term in aquariums, especially saltwater, any contact points on the metal will eventually corrode like any other steel.