Modular landscape devices, systems, and associated methods are provided. Fins can be attached to either the load-bearing member, where the fins are spaced apart from the buckling-restraining member by less than one inch, or the fins can be attached to the surrounding buckling-restraining member where the fins are spaced apart from the load-bearing member by less than one inch. The liquid detecting circuit includes electrode units disposed so as to be in contact with the liquid in the containers, which becomes electrically conductive when in contact with the liquid, an impedance, and an AC-signal source. Individual elemental impurities of the produced cobalt can be follows: Na and K less than 0.