For drain overflow (which is where the "used" chemistry comes out), I just drain them all into a 5 gallon bucket. If you have a plumbed drain and don't mind dumping it, that's even better.
For supply of fresh chems, which are drawn up by the replenishment unit, I use 5 gallon (I think that is the size - will check - it might be 2.5 gals) Doran tanks with floating lids. It minimizes oxidation of the chemistry. For storing chems from the tanks between use, I use 2-liter coke bottles (PET plastic) with all the air squeezed out. I've been using those with the CP-31 since it has 2L tanks and those work well for the purpose. When I get the CP-51 online, I will probably use 3 2L bottles per solution (Blix and Dev.) for the same purpose.
Those tanks you linked to look nice. The upside of the Doran tanks I use with floating lids is it minimizes air exposure to the replenishment solutions.
These are the ones I use:
http://www.bhphotovideo.com/c/produc...ge_Tank_5.html
Good luck!
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