What they are using and referring to is called a fume suppressant. It's usually a fluorocarbon that reduces the surface tension of thechrome plating bath so that the evolving hydrogen bubbles have lesscapacity to carry plating solution out. You can talk to DuPont or any local distributor of platingsupplies. First you have to determine if you are a 'decorative' chromeshop or a 'hard chrome' shop. You not only need to use the suppressant, but follow the rulesfor testing and recording your results.
Rules are in a state of flux, and local codes can overridefederal rules anyway.
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