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Model⁠×⁠filter compatibility · 51 models · 50 parts · verified 2026-07-03

Home / Spa filters / 817-5000 / 6540-471

Hot Tub & Spa Filter Cartridges

Replacement Spa Cartridge — Compatible with Pleatco PRB50-IN / Unicel C-4950 / Filbur FC-2390 (50 sq ft drop-in)

$14.99Change every 4 months

Guaranteed to fit these models

We verified this part against the models listed. If it doesn't fit a model we named, the return ships on us.

Replaces (OEM ref)817-5000 / 6540-471
Filtration / build50 sq ft — DROP-IN (no thread). The industry workhorse; fits most hard-shell hot tubs.
GradeReemay polyester pleated media
Pack1 cartridge
Replacement windowChange every 4 months

Price shown is a representative market price for the compatible part (market_snapshot); on the live store the price you see is the price you pay. Fit data is manufacturer-documented. Generic vs OEM →

Fits these models

Universal 50 sq ft drop-in spa cartridge (PRB50-IN)

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