Yeh, I see that agitation is certainly preferable if possible. In my case my tanks are 50 litres and rectangular (shaped a bit like a kitchen bin). I have cut a thin strip of aluminium (obviously titanium would be preferable) and bent it to form a rectangle and then drilled and woven the air line through the aluminium. The airline runs down the side of the tank - held in place by an aluminium wire - and the rectangle sits idle just off the bottom of the tank and when you fire it up the force of the air pushes it right against the bottom.
I only have one electrolyte bath but I also aerate my degrease, sealer, dye and rinsing tanks - I thought you would be the same ? I can do the whole whole lot from one 4 port air pump so I guess this would be cheaper for me.
Having said all this my only proof of the fact the system is moving the electrolyte about enough is the quality of the anodising. As you say it depends on the system so I am only really posting this for interests sake and for the benefit of those who might have a similar type of system to myself.
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