Charcoal filter problems with nickel sulfamate plating

A. I would try a 10 micron filter. The micron rating is from the polypropylene which basically keeps the activated carbon inside the filter. A 1 micron filter will filter at a very very slow rate.

A. Carbon polishing with carbon filter packs is a good idea, but keep in mind one cartridge can only treat so much solution. If the bath is 20 gallons or more I like to change the carbon pack every 2 hours. One micron rating should be fine. Low current density (3-5 asf) dummy plating could do some good. A stress reducer may have to be added to the bath if the problem persists. If applicable, check with your Ni supplier regarding the stress reducer, and the amount that should be added. Good Luck!