Please advise your customers to avoid sea water if possible and chemicals in the pool.
Acids (such as fruit juices and vinegar through to cleaning fluids etc…) and Alkalis (such as chlorine and other cleaning products etc…) can damage the silver especially matt silver and items with stones where glue has been used. It is advised to remove jewellery if you are going to be exposed to these chemicals.
Silver does tarnish especially when exposed to sweat and oils we recommend regular polishing with a silver cloth to keep the silver shiny and clean.
If your customers respect their jewellery and look after it, it will last a long time.