This is a 18" long Unicel FG-1003 replacement for the 59001800 used in various Pentair, American Products, Pac-Fab, and Heldor filters.
7 of these are used and 1 partial grid, #59001700, which is the same height but only 9-3/4" wide.
These filters have a total of 36 square feet of filter area.
See below for dimensions and more information.
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