Cryspool Hot Tub Replacement Filter 50 sq ft (5x13) for C-4950/PRB50-IN — Trilobal Media, Durable Fit

This Cryspool replacement cartridge is built to fit a wide range of hot tubs and spas that use the PRB50-IN/C-4950 form factor. It combines a 13 5/16" length and a 5" outside diameter with 2 1/8" open top and bottom cores to ensure a precise fit in compatible housings. The filter media uses advanced trilobal fibers for improved particle capture and longer life compared with standard point-bond fabrics.

Will this Cryspool filter fit my spa model?

Most spas that specify PRB50-IN, C-4950 or similar 5x13 drop-in cartridge filters will accept the Cryspool 04075 without modification. Check the length, outside diameter and core hole size against your existing cartridge to confirm fit. This filter is sold as a compatible replacement; the original manufacturer part numbers are provided for reference only.

• Length: 13 5/16" (matches many 5x13 cartridges)
• Outside diameter: 5" for snug seating in housings
• Top and bottom hole: 2 1/8" open core for flow compatibility
• Common cross-references: PRB50-IN, C-4950, Guardian 413-212-02 and more

How does the trilobal fiber media improve filtration?

The filter uses trilobal-shaped fibers to increase surface area and create deeper pleat loading compared to traditional point-bond materials. That design traps finer particles within the pleats and helps maintain flow during use. Deeper penetration also means a more thorough clean when rinsing, restoring much of the original performance.

• Trilobal fibers: higher filtration efficiency and dust-holding capacity
• Deeper pleat loading: reduces quick clogging and pressure spikes
• Durable media: designed for repeated cleaning cycles

What maintenance keeps this cartridge performing well?

Regular maintenance extends service life and preserves water quality. Rinse the cartridge with a high-pressure hose when the system pressure gauge reaches your predetermined cleaning level. For a deeper clean, use a cartridge cleaning solution and soak per the cleaner’s instructions before a final rinse.

• Rinse frequency: when filter pressure indicates cleaning is due
• Deep cleaning: use a cartridge cleaner soak periodically
• Replacement schedule: replace when pleats show wear or can't be restored

What makes Cryspool a practical replacement choice?

Cryspool balances affordability with upgraded materials and solid construction. The product offers reinforced pleats and reliable end caps so the cartridge stays seated and resists collapse. Because it's an independent brand replacement, it provides a cost-effective option without requiring the original OEM label.

• Qualified materials and end caps for durable use
• Easy cleaning design for repeatable performance
• Compatible with many common hot tub part numbers for convenience

Who is this for: The Cryspool 04075 cartridge is suitable for spa owners seeking an economical, high-performance replacement for PRB50-IN/C-4950 style filters. It’s ideal if you want a durable cartridge with advanced trilobal media that cleans well and fits most 5x13 drop-in filter housings. Choose this filter if you regularly maintain your spa, want reliable particle capture, and prefer a non-OEM alternative that matches standard dimensions.