Structural leaks: Leaks from the stainless structure and not from drain fittings signify a sink will need replacing. If the leak comes from a drain fitting, it is most likely a seal leak that can be repaired by a plumber. If leaking is from the stainless structure, including the corners, bottom of the bowl or where the sink bowls meets drain boards, replace the sink.
Denting: Dents in the sink bowl bottoms and drain boards are typical signs the sink has reached the end of its service life or the metal gauge of the sink construction is too light for the application. Upon replacement, if the latter is determined, operators should opt to purchase a sink of heavier gauge. The dents hold water and create sanitation issues due to not draining properly and holding water, which may create bacteria and contamination.
Corrosion: This is another sign a sink is deteriorating and the operator should replace it. Factors causing corrosion include using overly caustic or non-approved food-safe cleaning materials and staff dumping food and/or highly acidic liquids into the bowl. Cleaning materials or food product such as pickle juice will corrode sinks that are not thoroughly washed, rinsed and sanitized. Also, what appears to be rust at times can be simply various food product residues that have accumulated on the surface due to a lack of cleaning. This residue can be removed with proper cleaning methods using various food-safe products and will make a big difference in the appearance of the sink. If it is indeed rust, however, then the sink should be replaced.