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Pentair FNS Plus Filter Element Assembly Complete 36 Sqft
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Product Description
⌄The Pentair 59023500 is the complete internal grid assembly for the 36 sq ft FNS Plus DE filter. Rather than a loose set of grids to fit one at a time, it arrives as the whole element: manifold, grids, grid retainer and thru rod, assembled and ready to set into the tank.
When to replace the element
DE grids wear over years of backwashing and acid washing. Torn fabric lets DE pass back to the pool, blinded fabric shortens the cycle between cleanings, and a cracked manifold bypasses the grids altogether. If more than one or two grids are past saving, replacing the assembly as a unit is faster than rebuilding and gets the filter back to its rated flow in one step.
Fit
This assembly is sized for the 36 sq ft FNS Plus tank. The 48 and 60 sq ft models take taller grids and a different part number, so check the label on your tank before ordering. It is the genuine Pentair part listed on the FNS Plus parts diagram.