PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In

PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In

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$39.99 $75.99
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PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
  • PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
  • PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
  • PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
  • PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
  • PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
  • PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
  • PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
  • PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
  • PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
  • PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
  • PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
  • PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
  • PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
  • PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In
PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In

PRB25-IN Spa Filter Cartridge, 2-Pack — Cross-Ref Unicel C-4326, Filbur FC-2375/FC-2370, Guardian 413-106, 5" x 13-5/16" Drop-In

$39.99 $75.99 $20.00 each
ColorWhite

This is the PRB25-IN spa filter cartridge — a direct cross-reference for Unicel C-4326, Filbur FC-2375 and FC-2370, Guardian 413-106, and part numbers 3005845, 17-2327, 100586, 33521, 25392, and 817-2500. Same 5" diameter, 13-5/16" length, drop-in fit.

Also sold under these part numbers:

  • Unicel C-4326
  • Guardian 413-106
  • Filbur FC-2375 / FC-2370
  • 3005845
  • 17-2327
  • 100586
  • 33521
  • 25392
  • 817-2500

Why FilterCycle: No-hype replacement filters at a fair, consistent price — no lightning deals, no guessing if today's price is a good one. Order once, or subscribe on a cadence built around how often you actually use your spa. Subscribe and save 10% — cancel anytime.

Specs

  • Type: Pleated drop-in spa filter cartridge
  • Dimensions: 5" diameter x 13-5/16" length
  • Sold as: 2-pack

FAQ

Is the PRB25-IN filter the same as C-4326? Yes — C-4326 is Unicel's part number for the same cartridge. Filbur's equivalent is FC-2375 (or FC-2370 depending on packaging).

How do I know this is the right size? Measure your current filter: this cartridge is 5" in diameter and 13-5/16" long, drop-in style with no threaded neck.

How often should I replace it? Most spa owners replace every 4–6 weeks with regular use.

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