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> When I get enough used etchant saved up, I expect I'll make a bubble tank to regenerate to CuCl. I'm not sure what I'll do for storage at that point. But since I only do an occasional board here or there, it may be a while yet before I need to figure it out. :)
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I use a small vertical tank I made out of solvent welded 3/16" plexiglass with an aquarium heater on one side and a plastic tube with a row of tiny holes connected to an aquarium air pump as a bubbler. It holds about 2 quarts of etchant max and is good for up to about 6"x8" PCB.
The used etchant is currently stored in a clearly labeled plastic bottle that formerly held cleaning liquid but I'm gonna order a proper chemical bottle for it. I keep it in the garage in a plastic bag that has some baking soda in it just in case acid leaks. It was a small amount so I mixed it in the kitchen with the exhaust fan on, and I normally etch in the bathroom with the fan in there running. Once weather warms up I'll switch to doing it outside, but I haven't had problems with fumes.
Definitely wear gloves and safety glasses or goggles when working with this stuff, if you drop something and it splashes on your skin or in your eyes it will not feel good.