Unicel FS-2004 Complete DE Filter Grid Set | 48 sq. ft. | 7 Full + 1 Partial Grid | FG-1004 + PG-1904
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- SKU:
- FS-2004
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About This Item
The Unicel FS-2004 is a complete replacement DE filter grid set for 48 square foot diatomaceous earth filter systems. This set includes all 8 grids needed for a full filter re-grid — 7 full-size grids (FG-1004) plus 1 partial grid (PG-1904) — restoring your filter to factory performance in a single service.
📦 Complete DE Filter Grid Set — 8 Grids Included
This set includes everything needed for one complete filter re-grid: 7 full grids (FG-1004) + 1 partial grid (PG-1904). One set = one complete filter service.
⚠️ IMPORTANT: Compatibility — Pentair / Pac Fab / American Products Only
This set is engineered for Pentair, Pac Fab, and American Products 48 sq. ft. DE filters. It is not compatible with Hayward 48 sq. ft. DE filters (e.g., Hayward Pro-Grid DE4820, Micro-Clear DE4820) — Hayward uses a different partial grid geometry. Verify your filter brand and model before ordering.
Specifications
| Filter System Area | 48 sq. ft. (total system) |
| Grid Length | 24" (measured end to end, collar not included) |
| Grid Width | 11" |
| Collar Configuration | Open slot, 2 notches |
| Set Contents | 7 full grids (FG-1004) + 1 partial grid (PG-1904) = 8 grids total |
| Replaces OEM Part # | 59000500 (complete set); 59023300 (full grid ×7); 59023400 (partial grid ×1) |
| Material | High-grade DE filter fabric with reinforced seaming |
Note from Unicel: Collar has open slot (2 notches). Length is measured from one end of the grid to the other (collar not included).
Fits Into:
| OEM Brand | Filter Model | OEM Part Number | Grid Configuration |
| Pentair | FNS Plus 48 | 59000500 (set) | 7 full + 1 partial |
| Pentair | FNS 48 | 59000500 (set) | 7 full + 1 partial |
| Pentair – American Products | Titan RPM 48 | 59000500 (set) | 7 full + 1 partial |
| Pentair – American Products | Nautilus 48 | 59000500 (set) | 7 full + 1 partial |
| Pentair – Pac Fab | FNS 48 | 59000500 (set) | 7 full + 1 partial |
(This is not an exhaustive list.)
Pro Tip: Always turn off the pump and release all pressure from the filter tank via the air relief valve before opening the tank. When installing, verify each grid's collar notch seats correctly into the manifold — a misaligned or skipped grid causes unfiltered water bypass. Measure your existing full grid end to end (excluding collar) to confirm the 24" length matches before ordering.
Also known as: FS2004
