Purex/Pentair SMBW 72 Sq. Ft. Grid
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Purex/Pentair SMBW 72 Sq. Ft. Grid. This grid fits into a Purex SMBW style filter, which requires 8 if these grids. This filter can be recognized by the backwash valve position. The backwash valve for this filter is on the bottom of the filter and appears as a single stainless steel handle.