This is a 12" long Unicel PG-1902 replacement for the 59001000 used in various Pentair, American Products, Pac-Fab, and Heldor filters.
1 of these and 7 full grids, #59001100, which are the same height but are11-1/2" wide are used.
These filters have a total of 24 square feet of filter area.
See below for dimensions and more information.
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