I use 4 - 55 gallon food grade plastic barrels. They are kept outside as is my
RO/DI unit. The barrels are blue in color. I found the color is important when storing outside. My original white barrels actually promoted algae growth, the blue ones don't. I also store
NSW in blue barrels outside, no algae in them either.
I use a Brute trash barrel for mixing water.
Dick
