This is a 30" long Unicel PG-1905 replacement for the 59002900 used in various Pentair, American Products, Pac-Fab, and Heldor filters.
1 of these partial and 7 full grids, #59003000, which are the same height but are 11-1/2" wide are used in each filter.
These filters have a total of 60 square feet of filter area.
See below for dimensions and more information.
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