PPM35TC / C-5423 / FC-3623
35 sq ft replacement filter cartridge • 5.1875″ OD × 11.3125″ 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 | PPM35TC | Primary |
| Unicel | C-5423 | Equivalent |
| Filbur | FC-3623 | Equivalent |
| OEM | Marquis 370-215 | Original Equipment |
| OEM | Marquis 20045 | Original Equipment |
Always verify dimensions and end-cap type before purchasing a replacement.
Compatible Hot Tubs & Spas
The following spa models use the PPM35TC (or an interchangeable equivalent). Always confirm with your owner's manual.
Frequently Asked Questions
What are the dimensions of the PPM35TC?
The PPM35TC measures 5.1875 inches in outer diameter and 11.3125 inches in length, with a closed top and open bottom. It provides 35 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 PPM35TC?
The PPM35TC is interchangeable with C-5423, FC-3623, and OEM equivalents including Marquis 370-215, Marquis 20045. All of these share the same 5.1875" OD × 11.3125" dimensions and closed 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 PPM35TC filter cartridge?
The PPM35TC (35 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 PPM35TC filter cartridge?
The PPM35TC has a closed (solid) top end cap. 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 PPM35TC filter?
The PPM35TC is compatible with the following models: Marquis Reward, Marquis Euphoria. 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 | 5.1875″ |
|---|---|
| Length | 11.3125″ |
| Top Type | Closed (solid end cap) |
| Bottom Type | Open (no end cap) |
| Filtration Area | 35 sq ft |
| Primary Brand | Pleatco |
| Part Number | PPM35TC |