PCD75N / C-7375 / FC-3964
75 sq ft replacement filter cartridge • 7″ OD × 14.75″ 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 | PCD75N | Primary |
| Unicel | C-7375 | Equivalent |
| Filbur | FC-3964 | Equivalent |
| OEM | Caldera 73531 | Original Equipment |
| OEM | Caldera 1019301 | Original Equipment |
Always verify dimensions and end-cap type before purchasing a replacement.
Compatible Hot Tubs & Spas
The following spa models use the PCD75N (or an interchangeable equivalent). Always confirm with your owner's manual.
Frequently Asked Questions
What are the dimensions of the PCD75N?
The PCD75N measures 7 inches in outer diameter and 14.75 inches in length, with a open top and open bottom. It provides 75 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 PCD75N?
The PCD75N is interchangeable with C-7375, FC-3964, and OEM equivalents including Caldera 73531, Caldera 1019301. All of these share the same 7" OD × 14.75" 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 PCD75N filter cartridge?
At 75 sq ft, the PCD75N has plenty of filtration area for the volume of water in most hot tubs. Under typical residential use (2-4 people, 2-3 times per week), most owners replace it every 18-24 months. Monthly rinsing and a quarterly overnight soak in filter cleaner will keep it flowing freely and extend its life.
How do I clean a PCD75N filter cartridge?
The PCD75N 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 PCD75N filter?
The PCD75N is compatible with the following models: Caldera Palermo, Caldera Montclair, Caldera Niagara. 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 | 14.75″ |
| Top Type | Open (no end cap) |
| Bottom Type | Open (no end cap) |
| Filtration Area | 75 sq ft |
| Primary Brand | Pleatco |
| Part Number | PCD75N |