PCD50N / C-7350 / FC-3963
50 sq ft replacement filter cartridge • 7″ OD × 10.75″ 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 | PCD50N | Primary |
| Unicel | C-7350 | Equivalent |
| Filbur | FC-3963 | Equivalent |
| OEM | Caldera 73532 | Original Equipment |
| OEM | Caldera 1019401 | Original Equipment |
| OEM | Caldera X268330 | Original Equipment |
Always verify dimensions and end-cap type before purchasing a replacement.
Compatible Hot Tubs & Spas
The following spa models use the PCD50N (or an interchangeable equivalent). Always confirm with your owner's manual.
Frequently Asked Questions
What are the dimensions of the PCD50N?
The PCD50N measures 7 inches in outer diameter and 10.75 inches in length, with a open top and open bottom. It provides 50 square feet of filtration area. Always measure your existing cartridge or check the label inside the filter housing before ordering - outer diameter and length are the two critical dimensions, but end-cap style must also match.
What other part numbers are interchangeable with the PCD50N?
The PCD50N is interchangeable with C-7350, FC-3963, and OEM equivalents including Caldera 73532, Caldera 1019401, Caldera X268330. All of these share the same 7" OD × 10.75" dimensions and open top / open bottom end caps. When buying a cross-reference, confirm the end-cap style matches - a small difference in cap design can prevent proper seating in your filter housing.
How often should I replace a PCD50N filter cartridge?
The PCD50N (50 sq ft) is a mid-size spa filter. Plan on 12-24 months between replacements depending on how heavily the spa is used. Spas used daily or by multiple people will wear out filters faster than a spa used once or twice a week. A good rule of thumb: inspect it at every water change (every 3-4 months) and replace it when the pleats show tearing, channeling, or persistent discoloration.
How do I clean a PCD50N filter cartridge?
The PCD50N has open ends on both top and bottom, so water flows through freely. Remove the cartridge from its housing and rinse thoroughly with a garden hose, directing the stream at a 45-degree angle between the pleats - work from top to bottom, rotating around the cartridge. Avoid pressure washers, which collapse the pleats and permanently reduce filtration efficiency. For a deeper clean every 3-4 months, soak overnight in a hot tub filter cleaner solution, then rinse thoroughly. Never reinstall a wet cartridge if you're using a cartridge with a closed end - let it dry to prevent trapping moisture inside.
Which hot tubs and spas use the PCD50N filter?
The PCD50N is compatible with the following models: Caldera Kauai, Caldera Makena. Always cross-check your spa's owner manual or the label inside the filter compartment to confirm the correct part number.
Dimensions
Specifications
| Outer Diameter | 7″ |
|---|---|
| Length | 10.75″ |
| Top Type | Open (no end cap) |
| Bottom Type | Open (no end cap) |
| Filtration Area | 50 sq ft |
| Primary Brand | Pleatco |
| Part Number | PCD50N |