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PDC Spas OEM FLT-101SK spa filter (C-4310)
Nouveau
Replacement numbers
Unicel C-4310, Pleatco PWW10
Fits PDC Spas OEM FLT-101SK.
Diameter 4-1/4" (108 mm)Length 4" (102 mm)10 sq ft1 model listedSearch this part on Amazon
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| Unicel | C-4310 |
|---|---|
| Pleatco | PWW10 (Spec table PDF p.31: PWW10, 4-1/4" × 4", 2-1/16" open, 3 oz, 10 sq ft, Waterway Skim Filter 10, OEM 817-0010. PWW10PAIR is 20 sq ft. Cross-reference PDF p.47: C-4310 = PWW10.) |
| Filbur | FC-3077 |
| Top | 2-1/16" (52 mm) / open |
| Bottom | 2-1/16" (52 mm) / open |
Bottom: 2-1/16" (52 mm) / open
Drawn to scale from the listed diameter and length and open-end sizes. Handles, threads and closed ends are drawn as symbols, not to scale. 10 sq ft media.
Nouveau is the group name on the PDC Spas row C-4310 cartridge (OEM FLT-101SK). Match these numbers: OEM FLT-101SK; Unicel C-4310; Pleatco PWW10; Filbur FC-3077. 4-1/4" across, 4" long, top 2-1/16" / open, bottom 2-1/16" / open, 10 sq ft.
Catalog note for FLT-101SK: PDC’s 2025 guide: Nouveau, 1996–1999, FLT-101SK, 10 sq ft, 4-1/4" × 4", 2-1/16" holes, Pleatco PWW10. Unicel prints the same size for C-4310 (216 pleats, 3 oz, 2-1/16" both ends) and lists it on the PDC block. Pleatco’s cross sends C-4310 to PWW10 and prints PWW10 at 10 sq ft; PWW10PAIR is 20 sq ft and is not this row. Filbur prints FC-3077 at the same outside size with 1-15/16" openings.
C-4310 (OEM FLT-101SK), Pleatco side: Spec table PDF p.31: PWW10, 4-1/4" × 4", 2-1/16" open, 3 oz, 10 sq ft, Waterway Skim Filter 10, OEM 817-0010. PWW10PAIR is 20 sq ft. Cross-reference PDF p.47: C-4310 = PWW10..
FLT-101SK, Filbur note: Dimensional listing PDF p.8 (printed p.15) and PDC Spas section PDF p.23 (printed p.45): FC-3077, 4-1/4" × 4", 1-15/16" open, Skim Filter 10, PWW10, C-4310, 10 sq ft..
PDC Spas applications recorded for this cartridge: Nouveau, years 1996–1999, listed by PDC Spas Common Replacement Filter Elements (2025) (FLT-101SK, 10 sq ft skim filter. Pleatco PWW10, not the 20 sq ft pair.).
Hold C-4310 next to 4CH-15 differs by Unicel 4CH-15, no Pleatco number, no Filbur number, 4-5/8" diameter, 5-3/16" long, top dual bar handle, bottom 1-1/2" SAE, 15 sq ft, OEM FLT-1000-CART, note says PDC’s 2025 guide: XD1, XD1+ and the XD2 cold side, 2024 to present, FLT-1000-CART, 15 sq ft, 4-5/8" × 5-1/4", 1-1/2" SAE on the bottom, bar handle on a closed top, Waterway 817-0020. Unicel’s Waterway line prints 817-0020 as 4CH-15 at 4-5/8" × 5-3/16", dual bar handle, 1-1/2" SAE, 199 pleats, 3 oz, 15 sq ft. The length differs by 1/16". The dimensions on this row are Unicel’s. Pleatco’s 2023 cross-reference has no 4CH-15 and no 817-0020. Filbur’s PDC section does not list it. The XD2 spa side is FLT-171-CART, not this cartridge.; PRB7B differs by no Unicel number, Pleatco PRB7B, no Filbur number, 5" diameter, 4-5/8" long, top 2-1/8" / open, bottom 2-1/8" / open, 17 sq ft, OEM FLT-118, note says PDC’s 2025 guide is the only size: Timeless and XTR, 2000–2005, FLT-118, Pleatco PRB7B, 17 sq ft, 5" × 4-5/8", 2-1/8" holes. Pleatco’s 2023 deactivated list prints PRB7B with replacement N/A, and the spec table has no PRB7B row. Unicel’s PDC block lists C-4401 at 35 sq ft, 4-15/16" × 4-5/8", two per set, and does not print FLT-118 or PRB7B. Filbur’s PDC section prints that C-4401 set (FC-2386) and does not print PRB7B. Pleatco does not say PRB7B was replaced by PRB17.5SF-PAIR..
Left blank on purpose: End openings 2-1/16" (PDC, Unicel, Pleatco) vs 1-15/16" (Filbur FC-3077)..
Where those figures are printed: PDC Spas (manufacturer filter guide, 2025) on C-4310 (Nouveau, 1996–1999: FLT-101SK, 10 sq ft, 4-1/4" × 4", 2-1/16" holes, Pleatco PWW10). Unicel 2026 Replacement Guide on C-4310 (PDC block and spec table PDF p.6 (printed p.2): C-4310, 4-1/4" × 4", 2-1/16" open both ends, 216 pleats, 3 oz, 10 sq ft). Pleatco 2023 Catalog on C-4310 (PDF p.31: PWW10 at 10 sq ft, 2-1/16" openings. PDF p.47: C-4310 = PWW10.). Filbur Catalog & Reference Guide on C-4310 (PDF p.8 (printed p.15) and PDC section printed p.45: FC-3077, 1-15/16" openings, C-4310, 10 sq ft).
Hot tubs listed for this cartridge
The rest of the PDC Spas model list is the PDC Spas filter by model and year lookup.
| Model / system | Years | Listed by |
|---|---|---|
| Nouveau (FLT-101SK, 10 sq ft skim filter. Pleatco PWW10, not the 20 sq ft pair.) | 1996–1999 | PDC Spas Common Replacement Filter Elements (2025) |
Check the cartridge you removed
Measure diameter, length, and both ends, then compare them with the figures above. The steps are in the measuring guide. Why the bottom decides whether it seals: open-end vs threaded filters. Power, the retainer, and not running the spa empty: how to install a cartridge. Number formats: how Filbur, Unicel and Pleatco numbers compare.
The same C-4310 number is also on the Waterway Plastics page.
Other PDC Spas cartridges
- 4CH-15 cartridge (OEM FLT-1000-CART), 4-5/8" (117 mm) × 5-3/16" (132 mm)
- PRB7B cartridge (OEM FLT-118), 5" (127 mm) × 4-5/8" (117 mm)
- C-4405 cartridge (OEM FLT-171-CART), 4-15/16" (125 mm) × 6-5/8" (168 mm)
- C-4326 cartridge (OEM FLT-201TL), 4-15/16" (125 mm) × 13-5/16" (338 mm)
- 4CH-949 cartridge (OEM FLT-SWIM50-CART), 4-15/16" (125 mm) × 13-1/2" (343 mm)
- C-4975 cartridge (OEM FLT-SWIM75-CART), 4-15/16" (125 mm) × 20-1/8" (511 mm)
Every number on this row, on one screen: cross-reference lookup. Published clean and replace intervals for this cartridge, and a buy link for the numbers above: replacement schedule and reorder. The interval comparison by brand: calculator.
Cleaner and test strips
Hose rinse and soak steps are in how to clean a cartridge. Named cleaners and strips are in filter cleaners and test strips.
Filter cleaner and test strips
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Leisure Time O Filter Clean Cartridge Cleaner Listing title: cartridge cleaner, 32 fl oz.
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SpaGuard Filter Cleaner Listing title: filter cleaner for spas and hot tubs, 1 quart.
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AquaChek SPA 6-in-1 Test Strips Listing title: reads total bromine, total chlorine, free chlorine, pH, total alkalinity and total hardness.
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Sources
- PDC Spas (manufacturer filter guide, 2025): Nouveau, 1996–1999: FLT-101SK, 10 sq ft, 4-1/4" × 4", 2-1/16" holes, Pleatco PWW10 (PDF)
- Unicel 2026 Replacement Guide: PDC block and spec table PDF p.6 (printed p.2): C-4310, 4-1/4" × 4", 2-1/16" open both ends, 216 pleats, 3 oz, 10 sq ft (PDF)
- Pleatco 2023 Catalog: PDF p.31: PWW10 at 10 sq ft, 2-1/16" openings. PDF p.47: C-4310 = PWW10. (PDF)
- Filbur Catalog & Reference Guide: PDF p.8 (printed p.15) and PDC section printed p.45: FC-3077, 1-15/16" openings, C-4310, 10 sq ft (PDF)
Not in sources: End openings 2-1/16" (PDC, Unicel, Pleatco) vs 1-15/16" (Filbur FC-3077)..