PWW50P3 / 6CH-940 / FC-0359
50 sq ft replacement filter cartridge • 6″ OD × 7.625″ 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 | PWW50P3 | Primary |
| Unicel | 6CH-940 | Equivalent |
| Filbur | FC-0359 | Equivalent |
| OEM | Waterway 817-0050 | Original Equipment |
| OEM | Waterway 03FIL1400 | Original Equipment |
| OEM | Waterway 25252 | Original Equipment |
| OEM | Waterway 378902 | Original Equipment |
| OEM | Master Spas X268549 | Original Equipment |
Always verify dimensions and end-cap type before purchasing a replacement.
Compatible Pool Filter Systems
| Brand | Model |
|---|---|
| Waterway | Front Access Skimmer |
Frequently Asked Questions
What are the dimensions of the PWW50P3?
The PWW50P3 measures 6 inches in outer diameter and 7.625 inches in length, with a handle 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 PWW50P3?
The PWW50P3 is interchangeable with 6CH-940, FC-0359, and OEM equivalents including Waterway 817-0050, Waterway 03FIL1400, Waterway 25252, Waterway 378902, Master Spas X268549. All of these share the same 6" OD × 7.625" dimensions and handle 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 PWW50P3 filter cartridge?
The PWW50P3 (50 sq ft) is sized for smaller pool filter systems. Plan to inspect it every 3 months and replace it every 12-18 months. Heavy debris loads, high bather traffic, or imbalanced pool chemistry will shorten that timeline - if your filter pressure rises more than 8-10 psi above the clean starting pressure, it's time to clean or replace.
How do I clean a PWW50P3 filter cartridge?
The PWW50P3 has a handle on top, making it easier to lift out of the housing without touching the filter media. 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, soak the cartridge in a dedicated pool filter cleaner solution (following the product's dwell time instructions), then rinse completely before reinstalling. Having a spare cartridge on hand lets you swap and soak while the pool stays running.
Which hot tubs and spas use the PWW50P3 filter?
Refer to your spa's owner manual or the label inside the filter compartment to confirm compatibility. The part number is usually printed on the end cap of the existing cartridge.
Dimensions
Specifications
| Outer Diameter | 6″ |
|---|---|
| Length | 7.625″ |
| Top Type | Handle |
| Bottom Type | Open (no end cap) |
| Filtration Area | 50 sq ft |
| Primary Brand | Pleatco |
| Part Number | PWW50P3 |