Inside my 50G drum is the Mag12 pump and heater. Pump feeds the top bulkhead and returns to the bottom bulkhead and mixing outlets.
Plumbing on outside of barrel where I can send the NSW to the tank or recirculate it with the 2 ball valves.
The T where the line is tied in to a main drain. These ball valves send old tank water to the drain or NSW to the tank.
My mixing station as a whole with the Vertex RO/DI, the Apex Energy Bar 4, and the 50G mixing barrel.
I have a second barrel but not sure I need an extra 50G of RO/DI around yet. I may just tie on a 5G pail instead.