Buy the full set of (8) filter grids and save!
These require a bottom manifold. Grids 18" tall.
Pentair Purex Filter Grids Full Set SM,SMBW 36 SQ.FT.
You get the full set of (8) Filbur filter grids to replace models SM,SMBW 2036,4036 pool filters. (8) Grids
Replaces 074923 FC9230 FG1236