I used an electric air pump for filling pools, car tires etc. (noisy, but big volume) I think the amps were too low though, when I upped the amps I got the grey film back but the plate seemed better. I used test pieces and the clear finish came off easy in some areas but had to be basted off and then ground off on the pieces that had the grey film on. but increased air and larger bubbles made a huge difference on the finish. I used a porus hose to start with and got pitting that went right to the metal and a bitch to fix. I also took the lid off a large can of coffee drilled holes in it and apoxied it to the bottom of the plating pail. I drilled a hole in the side of the pail and fed the air hose directly to the lid and apoxied the hose in place. It good even agitation, low profile and gave a lip to hold the plates in place. the last piece I took out was a pulley for my car, grey film but when buffed the best effort to date . . . aced it.
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