Camden tablets (sulfites) are used to sterilize the must, but are also used to prevent oxidation of wines when racking or bottling. Usually used 1 tablet per gallon, the tablets are crushed & mixed with a small amount of water; though for initial must sanitation some simply add the dry powder & stir it in... I would advise against the dry method for use before bottling. I always sulfite a must that uses non-pasturized fruit/juice, and at bottling, but I've never used it on anything I was going to carb at bottling, so I really couldn't say if it will have an impact on carbonation, but I suspect it would at least slow down the process, if not prevent it in the 1st place. If I'm off-base on this, I hope someone will jump in & inform us both. Hope you find some of this info useful, GF.