I just started on my 4x processing setup today lol. It's a big step up given how big the multiblock salination thingy is.
Gas tank I hadn't considered, i'll try that.
Not sure the dynamic tank will work, I think that's for liquids and pretty sure HCl is a gas (given that mechanical pipes won't connect to the chemical infuser but pressurised tube thingies will).
The gas tank will work then. The dynamic tank should work if you condense the gas into a liquid first.