PRB50-IN / C-4950 / FC-2390
50 sq ft replacement filter cartridge • 5″ OD × 13.3125″ long
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Use the part-number links below to compare compatible cartridges. Prices and availability vary, so verify dimensions before ordering.
Cross-Reference & Interchangeable Part Numbers
| Brand | Part Number | Type |
|---|---|---|
| Pleatco | PRB50-IN | Primary |
| Unicel | C-4950 | Equivalent |
| Filbur | FC-2390 | Equivalent |
| OEM | Jacuzzi 373045 | Original Equipment |
| OEM | Jacuzzi 373045J | Original Equipment |
| OEM | Guardian 413-212-02 | Original Equipment |
| OEM | Waterway 817-5000 | Original Equipment |
| OEM | Caldera 73533 | Original Equipment |
Always verify dimensions and end-cap type before purchasing a replacement.
Compatible Hot Tubs & Spas
The following spa models use the PRB50-IN (or an interchangeable equivalent). Always confirm with your owner's manual.
Frequently Asked Questions
What are the dimensions of the PRB50-IN?
The PRB50-IN measures 5 inches in outer diameter and 13.3125 inches in length, with a open top and open bottom. It provides 50 square feet of filtration area.
What other part numbers are interchangeable with the PRB50-IN?
The PRB50-IN is interchangeable with C-4950, FC-2390, and OEM equivalents including Jacuzzi 373045, Jacuzzi 373045J, Guardian 413-212-02, Waterway 817-5000, Caldera 73533. Always verify dimensions and end-cap type before purchasing a replacement.
How often should I replace a PRB50-IN filter cartridge?
Pool and spa filter cartridges typically last 12–24 months under normal use, depending on bather load, chemical balance, and how often the filter is cleaned. Most manufacturers recommend inspecting the cartridge every 3–4 months and replacing it annually or when the pleats show signs of tearing, channeling, or cannot be fully cleaned.
How do I clean a PRB50-IN filter cartridge?
Remove the cartridge and rinse it with a garden hose, spraying at a 45-degree angle between the pleats from top to bottom. For a deeper clean, soak the cartridge overnight in a dedicated filter-cleaning solution, then rinse thoroughly. Never use a pressure washer as it damages the pleats. Allow the cartridge to dry completely before re-inserting if using a spare.
Which hot tubs and spas use the PRB50-IN filter?
The PRB50-IN is compatible with the following models: Jacuzzi J-210, Jacuzzi J-220, Jacuzzi J-230, Jacuzzi J-235, Jacuzzi J-245, Jacuzzi J-275, Caldera Oasis. Always cross-check your spa's owner manual or the label inside the filter compartment to confirm the correct part number.
Specifications
| Outer Diameter | 5″ |
|---|---|
| Length | 13.3125″ |
| Top Type | Open (no end cap) |
| Bottom Type | Open (no end cap) |
| Filtration Area | 50 sq ft |
| Primary Brand | Pleatco |
| Part Number | PRB50-IN |