Description
Meet the Filbur Rectangular Diatomaceous Earth [DE] Grid in the FC-9810 family — a precision-fit 18" x 5" center-port DE grid designed to restore efficient filtration in compatible pool filters. Although Filbur has discontinued this model, it remains a reliable, direct replacement for legacy systems that require FC-9810 or the listed alternate part numbers. If you’re maintaining an aging DE filter, this grid helps you maintain clear water and balanced flow without guessing at compatibility.
Compatibility and use cases
This rectangular DE grid is purpose-built for 18" x 5" DE filter assemblies with a center port. It’s specifically listed as a replacement for the following part numbers: 23900-0031, 46451, 4687-03, FG-3005, and SQ-5. If your filter relies on the FC-9810 grid, this part is designed to slot in cleanly, preserving the filtration performance you expect from a trusted Filbur component. Ideal for pool owners and service professionals who work with older, legacy DE filter systems that need dependable, name-brand replacements.
Why this DE grid matters
- Consistent DE distribution — the rectangular geometry and center-port design help spread diatomaceous earth evenly across the filter media, promoting even backwash and reducing bypass.
- Reliable fit for legacy equipment — engineered to match specific dimensions (18" x 5") and center-port configurations, minimizing guesswork during replacement.
- Durable construction — built to withstand routine cleaning and backwashing cycles typical of residential and commercial pool maintenance, helping extend filter life when used as intended.
- Direct replacement lineage — connects to multiple legacy part numbers (23900-0031, 46451, 4687-03, FG-3005, SQ-5), giving you a clear path to restore original filtration performance even after the manufacturer cycles the product out.
What you can expect
By installing the FC-9810 DE grid, you’ll maintain effective particle capture, clearer water, and stable pressure across your DE filter. This is particularly valuable if your system relies on a specific DE grid geometry and porting to maintain optimal flow rates and filtration efficiency. It’s a practical choice for replacing worn or cracked grids without retooling your entire filter assembly.
Who this is for
- Pool owners with older Filbur DE filters that require FC-9810 or the compatible replacement numbers listed above.
- Pool service technicians handling maintenance or retrofits on legacy DE filtration systems.
- DIY enthusiasts seeking a legitimate, brand-backed replacement part to preserve filter performance without upgrading to a newer model.
Practical tips for a smooth replacement
Before you swap in the new grid, confirm the dimension and port configuration match your filter housing. Handle the grid carefully to avoid cracks, and follow your filter manufacturer’s backwash and cleaning routine after installation to ensure the DE layer remains evenly distributed. Since this grid is a discontinued Filbur part, stock availability may be limited, so verify compatibility with your filter model and have a backup on hand if feasible.