DPM DE Filter Replacement Grid Set for Pentair FNS 48 - Durable USA

Our review of the DPM Swimming Pool DE Filter Replacement Grid set finds it best for pool owners who need a full rebuild for a Pentair FNS 48 filter and want a durable, made-in-USA option. The biggest reason to buy is straightforward: this 8-piece set (seven full grids plus one partial) delivers OEM-compatible filtration area and reinforced construction that makes it a practical, cost-effective way to restore filtration performance without replacing the entire tank. Installation is simple for anyone familiar with cartridge or grid swaps, and the materials aim to resist common pool chemicals.

Key Features

• Made in USA: The grids are manufactured domestically, which can mean consistent build quality and materials that meet expected standards.
• Complete 8-piece set: Includes seven full 48 sq ft grids and one partial grid to recreate the original 48 sq ft arrangement for Pentair FNS 48 filters.
• Reinforced core: Each grid has a heavy-duty reinforced core for added stability and longer service life under normal pool conditions.
• Chemical resistant fabric: The synthetic filter media is designed to exceed OEM chemical resistance specifications to withstand common pool sanitizers.
• Compatible sizing: Full grids measure 24 in height by 11 in width and the partial grid measures 24 in height by 9 3/4 in width to fit PG-1904/FG-1004 style assemblies.
• Restores filtration: Using the complete set restores the intended filtration area, improving water clarity and circulation compared with worn grids.

Who It's For

This set is aimed at pool owners or service technicians who have a Pentair FNS 48 multi-grid filter (models listed as PG-1904, FG-1004, FC-9340, FC-9440 and related part numbers) and need to replace worn or damaged grids. It is particularly useful when several grids are aged or torn and a complete grid refresh will return the system to designed performance.

Those who should look elsewhere include owners of different filter platforms or those who prefer OEM-branded parts for warranty or matching reasons; also customers wanting a single spare grid instead of a full set should purchase individual replacements that match their specific tank configuration.

Pros & Cons

Pros

• Good fit and compatibility with Pentair FNS 48 tanks, including older units according to buyers.
• Durable synthetic media and reinforced cores provide stability and expected longevity in normal use.
• Reasonable value for a full 8-piece replacement set versus buying individual OEM grids.

Cons

• Some users report occasional tearing of fabric on individual grids, so careful handling during installation is advised.

Specifications

Brand	Discount Pool Mart
Set contents	7 full grids + 1 partial grid (8 pieces)
Total style compatibility	Pentasir FNS 48 style: PG-1904, FG-1004, FC-9340, FC-9440
Full grid size	24 in height x 11 in width (48 sq ft each)
Partial grid size	24 in height x 9 3/4 in width
Core construction	Heavy-duty reinforced core

Our Verdict

The DPM DE filter grid set is a practical, value-focused replacement for Pentair FNS 48 owners who want to restore original filtration area and durability without buying OEM assemblies. It performs well when installed with care, offers chemical resistance and reinforced cores, and represents a cost-effective route to cleaner pool water for most residential systems.

Frequently Asked Questions

Will this set fit my Pentair FNS 48 filter?
Yes, the set is sized for Pentair FNS 48 configurations and lists compatibility with PG-1904, FG-1004, FC-9340 and FC-9440 style assemblies.

How many grids are included?
The package includes eight grid pieces: seven full 48 sq ft grids and one partial grid to recreate the original filter layout.

Are the grids chemical resistant?
Yes, the synthetic filter fabric is described as chemical resistant and designed to exceed OEM specifications for pool sanitizer exposure.