Grid = plastic support stand that goes underneath the felt pad,
Used inside Potassium Permanganate feeder tanks made by Clack Corporation.
Manufacturer's part number H7001Felt pad ( sold separately, N1043 )
sits on this plastic shelf ( or grid ) and the KMnO4 sits on top of the pad.NOT used in "Salt Tanks".. those are much larger GRIDS.
This Grid = 10 inches Diameter, a Height of 5 inches.