Pentair FNS Plus DE Pool Filter 180009 – 60 Sq Ft High-Clarity Filtration
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The Pentair FNS Plus DE Pool Filter 180009 is engineered to provide exceptionally clear, sparkling pool water using the superior filtration performance of diatomaceous earth (DE). With a 60 sq ft filtration area, this FNS Plus model is ideal for medium to large pools that demand top-tier water clarity.
Built with a heavy-duty injection-molded tank, corrosion-resistant components, and a reinforced internal grid assembly, the FNS Plus series is designed for long-lasting reliability. The filter’s curved grid design improves dirt-holding capacity, reduces maintenance frequency, and maximizes filtration efficiency—capturing even the finest particles as small as 2–5 microns.
The easy-to-access top manifold design allows quick cleaning and servicing, while the efficient flow system helps reduce energy costs when paired with variable-speed pumps. Whether for residential or commercial use, the FNS Plus 180009 provides unmatched clarity and professional-grade performance.
Frequently asked questions
What size filter do I need?
Filter area is matched to pump flow rate, not to pool volume alone. An oversized filter runs longer between cleanings and puts less back pressure on the pump, which is why installers routinely size up rather than to the minimum.
What is the part number for this filter?
Pentair lists this filter under part number 180009. Quote 180009 when you cross-reference against your equipment manual, an existing part, or a parts diagram, so you are comparing the same revision.
How do I know when to clean the filter?
Note the pressure on a clean filter, then clean when the gauge climbs roughly 8 to 10 PSI above that baseline. Cleaning on a fixed calendar instead of the gauge either wastes effort or lets flow drop far enough to strain the pump.
How do I confirm this fits my equipment?
Match the part number stamped on the component you are replacing, or look it up in the parts list for your Pentair equipment. If your model or serial number is not named on this page, send it to us before you order and we will confirm the fit.
Does this listing include the internal filter elements?
Check the specification section above. Filter tanks are sold both complete and as bodies without cartridges, grids or laterals, and those internals are a significant part of the replacement cost.
Is there a warranty on this filter?
It carries the standard Pentair manufacturer warranty. The terms are set by Pentair, and on some equipment the coverage only applies when a licensed professional performs the installation. Keep the receipt and packaging until you have confirmed correct operation.