4-15/16" × 13-5/16"
PDC Spas spa filters
PDC’s 2025 filter guide assigns a factory number by series and year: FLT-201TL for Luxury, Premium, SE and LX from 1990 on, FLT-171-CART for LifeStyle, the XD2 spa side and River from 2010 on, and a different threaded cartridge, FLT-1000-CART, for the XD2 cold side from 2024 on.
The same guide puts Timeless and XTR (2000–2005) on Pleatco PRB7B, which Pleatco’s 2023 list marks deactivated, and it rates the River cartridge at 25 sq ft where Unicel and Filbur print 50 for that C-4405 body. Those conflicts are on the PDC filter page.
This page lists 7 PDC Spas replacement cartridges from the Unicel 2026 Replacement Guide, the Pleatco 2023 catalog, the Filbur catalog and manufacturer and retailer pages, plus model and model-year fitment for 7 of them (7 hot tub models in total). 5 have a Filbur number. Find your spa filter by the OEM part number on the end cap, or measure it and compare sizes below.
Clean and replace intervals for one cartridge on this list, plus the cross-reference numbers and a buy link: filter replacement schedule and reorder.
- FLT-201TLC-4326, 4-15/16" (125 mm) × 13-5/16" (338 mm)See replacement
- FLT-171-CARTC-4405, 4-15/16" (125 mm) × 6-5/8" (168 mm)See replacement
- FLT-118not listed, 5" (127 mm) × 4-5/8" (117 mm)See replacement
- FLT-101SKC-4310, 4-1/4" (108 mm) × 4" (102 mm)See replacement
- FLT-1000-CART; 817-00204CH-15, 4-5/8" (117 mm) × 5-3/16" (132 mm)See replacement
- FLT-SWIM50-CART4CH-949, 4-15/16" (125 mm) × 13-1/2" (343 mm)See replacement
- FLT-SWIM75-CARTC-4975, 4-15/16" (125 mm) × 20-1/8" (511 mm)See replacement
| Cartridge | Unicel | Pleatco | Filbur | Size | Fits | Status |
|---|---|---|---|---|---|---|
| FLT-201TL | C-4326 | PRB25-IN | FC-2375 | 4-15/16" (125 mm) × 13-5/16" (338 mm), 25 sq ft | 1 model | verified |
| FLT-171-CART | C-4405 | PRB25SF-JH-PAIR | FC-2387 | 4-15/16" (125 mm) × 6-5/8" (168 mm), 25 sq ft | 1 model | verified |
| FLT-118 | not listed | PRB7B | not listed | 5" (127 mm) × 4-5/8" (117 mm), 17 sq ft | 1 model | verified |
| FLT-101SK | C-4310 | PWW10 | FC-3077 | 4-1/4" (108 mm) × 4" (102 mm), 10 sq ft | 1 model | verified |
| FLT-1000-CART; 817-0020 | 4CH-15 | not listed | not listed | 4-5/8" (117 mm) × 5-3/16" (132 mm), 15 sq ft | 1 model | verified |
| FLT-SWIM50-CART | 4CH-949 | PWW50L | FC-0172 | 4-15/16" (125 mm) × 13-1/2" (343 mm), 50 sq ft | 1 model | verified |
| FLT-SWIM75-CART | C-4975 | PRB75 | FC-2395 | 4-15/16" (125 mm) × 20-1/8" (511 mm), 75 sq ft | 1 model | verified |
Know your model but not the part number? See PDC Spas filter by model and year.
Brands that share cartridges with PDC Spas
- Waterway Plastics, same part numbers C-4326, C-4310, 4CH-949
- Beachcomber, same part numbers C-4326, C-4405
- Coleman Spas, same part number C-4326
- Freedom Spas, same part number C-4405
- Hot Spot, same part number C-4326
Guides that apply to PDC Spas
- Why 25 and 50 sq ft can share the River cartridge
- Open-end vs threaded, for the XD cold-side cartridge
- How Filbur, Unicel and Pleatco numbers compare
- How to find your spa filter size
- How to install a cartridge
- All guides
Search PDC Spas part numbers on Amazon
Each button opens an Amazon search for that part number. The cartridge page is where the cited size and fittings are. Match those before you buy.
Part numbers from this table
-
C-4326 cartridge (OEM FLT-201TL) -
C-4405 cartridge (OEM FLT-171-CART) 4-15/16" × 6-5/8"
-
PRB7B cartridge (OEM FLT-118) 5" × 4-5/8"
-
C-4310 cartridge (OEM FLT-101SK) 4-1/4" × 4"
Disclosure: we may earn a commission from qualifying purchases made through retailer links on this site, at no extra cost to you. As an Amazon Associate I earn from qualifying purchases. Amazon links on this page go to Amazon.com and are affiliate links; they never change what we write, and the list is not ranked by commission. Each “Search on Amazon” button opens an Amazon search for the part or product name shown, not a single listing we pre-checked. Check size, quantity and your spa maker’s guidance before you buy. See our affiliate disclosure.
Model-year fitment comes only from the sources named on each cartridge page. Where no source lists models or years, the page says so.