What kind of fluid do you use in one?
I got my unit and solution from Omegasonics and it's a detergent that is mixed with water at a ratio of 10/1. Ten parts water to one part detergent. I have a motorcycle repair shop and use it mainly for carburetors and other small parts that I don't want to bead blast to clean. I use it on all of my stainless parts as well as my stainless handguns. I questioned the salesman as to whether the solution would effect blueing on a gun and he had no idea. He said they don't reallly sell to gunsmiths or anyone in the gun industry. Some day I have to get a blued piece to sacrifice to it.
The model I have is #4375.
The solution is at the bottom of this page.
http://www.omegasonics.com/industrial/catalog.shtmlUnfortunately, it seems they only sell it in large 5 gallon containers.
Maybe give them a call and see if they will sell you a quart of it. It will last you a lifetime in the machine you have. If not, give me a shout and I'll take a quart out of my 5 gallon pail and sell it to you. My cost plus shipping.
fastlane@catskill.net
Or do a search for other companies that make parts washers. They should also have solution. BTW, Brownells sells them and I'm sure they have solution also. But they are VERY expensive there.
http://www.brownells.com/aspx/NS/store/ProductDetail.aspx?p=5539Let me know.
(edit)... BTW, just a warning. Make sure that there is a basket for the parts in your unit. If it doesn't have one, try to make or buy one made of stainless steel, because if you just lay parts in the bottom of the unit, it will eventually eat through the bottom. I guess that the vibration of the part against the bottom will eat away at it and cause a failure.
Stay Safe,
Franz