4-5/8" × 11-7/8"
Dimension One Spas spa filters
Dimension One Spas use OEM numbers in the 1561-xx series, and their cartridges range from 4-5/8" top-loaders to 7" diameter models. Several share a size but differ in the fitting: the 4CH-940 and 4CH-950 cartridges have a 1-1/4" SAE thread, 7CH-975 has a 1-1/2" SAE thread, and 7CH-752 has a different bottom again.
The SpaBerry-style C-7367 is flagged by both Unicel and Filbur for Dimension One 75 models dated after 2000. Where Unicel, Pleatco and Filbur print slightly different sizes or area ratings, the note on the cartridge page says which figure we show.
This page lists 12 Dimension One 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 9 of them (20 hot tub models in total). 10 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.
- 1561-144CH-30, 4-5/8" (117 mm) × 11-7/8" (302 mm)See replacement
- 1561-054CH-50, 4-5/8" (117 mm) × 14-3/4" (375 mm)See replacement
- 1561-06; 1561-074CH-65, 4-5/8" (117 mm) × 19-5/8" (498 mm)See replacement
- 1561-134CH-940, 4-5/8" (117 mm) × 15" (381 mm)See replacement
- 1561-044CH-950, 4-5/8" (117 mm) × 12" (305 mm)See replacement
- 1561-107CH-552, 7" (178 mm) × 10-1/2" (267 mm)See replacement
- 1561-027CH-752, 7" (178 mm) × 14-3/4" (375 mm)See replacement
- 1561-127CH-975, 7" (178 mm) × 10-1/2" (267 mm)See replacement
- 1561-03C-4340, 4-15/16" (125 mm) × 11-5/8" (295 mm)See replacement
- 1561-09C-5404, 5-1/2" (140 mm) × 17" (432 mm)See replacement
- 1561-00C-7367, 7-1/8" (181 mm) × 10-1/2" (267 mm)See replacement
- 1561-01C-7335, 7-1/8" (181 mm) × 5-7/8" (149 mm)See replacement
| Cartridge | Unicel | Pleatco | Filbur | Size | Fits | Status |
|---|---|---|---|---|---|---|
| 1561-14 | 4CH-30 | PTL25P-4 | FC-0141 | 4-5/8" (117 mm) × 11-7/8" (302 mm), 25 sq ft | 3 models | verified |
| 1561-05 | 4CH-50 | PTL50P-4 | FC-0151 | 4-5/8" (117 mm) × 14-3/4" (375 mm), 50 sq ft | 3 models | verified |
| 1561-06; 1561-07 | 4CH-65 | not listed | not listed | 4-5/8" (117 mm) × 19-5/8" (498 mm), 65 sq ft | not listed | verified |
| 1561-13 | 4CH-940 | PDO-UF40P2 | FC-0177 | 4-5/8" (117 mm) × 15" (381 mm), 40 sq ft | not listed | verified |
| 1561-04 | 4CH-950 | PDO-UF25P2 | FC-0173 | 4-5/8" (117 mm) × 12" (305 mm), 25 sq ft | 2 models | verified |
| 1561-10 | 7CH-552 | not listed | not listed | 7" (178 mm) × 10-1/2" (267 mm), 52 sq ft | 2 models | verified |
| 1561-02 | 7CH-752 | PTL75XW-F2M | FC-0470 | 7" (178 mm) × 14-3/4" (375 mm), 75 sq ft | 4 models | verified |
| 1561-12 | 7CH-975 | PDO75P3 | FC-0475 | 7" (178 mm) × 10-1/2" (267 mm), 75 sq ft | 2 models | verified |
| 1561-03 | C-4340 | PMT40 | FC-3081 | 4-15/16" (125 mm) × 11-5/8" (295 mm), 40 sq ft | 1 model | verified |
| 1561-09 | C-5404 | PDO40-4 | FC-3097 | 5-1/2" (140 mm) × 17" (432 mm), 40 sq ft | 1 model | verified |
| 1561-00 | C-7367 | PDO75-2000 | FC-3059 | 7-1/8" (181 mm) × 10-1/2" (267 mm), 75 sq ft | 4 models | verified |
| 1561-01 | C-7335 | not listed | FC-3058 | 7-1/8" (181 mm) × 5-7/8" (149 mm), 35 sq ft | not listed | verified |
Know your model but not the part number? See Dimension One Spas filter by model and year.
1 of these rows do not have enough detail for a stand-alone page (for example, no OEM number or no second cross-reference), so their pages are kept out of search results and this table is the main reference for them.
Brands that share cartridges with Dimension One Spas
- Saratoga Spas, same part numbers 4CH-30, 4CH-950
- Freedom Spas, same part number 4CH-30
- Sundance, same part number 4CH-30
Guides that apply to Dimension One Spas
- Open-end vs threaded hot tub filters
- How Filbur, Unicel and Pleatco numbers compare
- How to find your spa filter size
- How to install a cartridge
- All guides
Search Dimension One 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
-
4CH-30 cartridge (OEM 1561-14) -
4CH-50 cartridge (OEM 1561-05) 4-5/8" × 14-3/4"
-
4CH-65 cartridge (OEM 1561-06) 4-5/8" × 19-5/8"
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4CH-940 cartridge (OEM 1561-13) 4-5/8" × 15"
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.