Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
Freedom Spas spa filter (6CH-45)
Freedom Spas
Replacement numbers
Unicel 6CH-45, Pleatco PTL45W-P-4
Fits Freedom Spas.
Diameter 6" (152 mm)Length 12-3/8" (314 mm)45 sq ft2 models listedUnicel 6CH-45
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| Unicel | 6CH-45 |
|---|---|
| Pleatco | PTL45W-P-4 (Filbur prints PTL45W-P-4. Aladdin prints PTL45W-P4-4 on part 14506. Not taken from Pleatco's Unicel cross-reference.) |
| Filbur | FC-0330 |
| Top | semi-circular handle |
| Bottom | 1-1/2” male thread/MPT |
Bottom: 1-1/2” male thread/MPT
Drawn to scale from the listed diameter and length. Handles, threads and closed ends are drawn as symbols, not to scale. 45 sq ft media.
Freedom Spas files this cartridge as 6CH-45 cartridge, in the Freedom Spas group. Numbers on the row: Unicel 6CH-45; Pleatco PTL45W-P-4; Filbur FC-0330. 6" across, 12-3/8" long, top semi-circular handle, bottom 1-1/2” male thread/MPT, 45 sq ft.
What the sources add about PTL45W-P-4: Length is Unicel's 12-3/8", which Aladdin 14506 also prints. Filbur's size table and Freedom Spas section print FC-0330 at 12-1/4". Unicel names Statesman, Lexington, Enterprise, Aristocrat and Franklin. Aladdin's model field matches that string and names Freedom Spas and Master Spas. Pleatco's number here is Filbur's cell (PTL45W-P-4); Aladdin prints PTL45W-P4-4.
6CH-45 (OEM 6CH-45 cartridge), Pleatco side: Filbur prints PTL45W-P-4. Aladdin prints PTL45W-P4-4 on part 14506. Not taken from Pleatco's Unicel cross-reference..
PTL45W-P-4, Filbur note: Size table PDF p.10: FC-0330, 6" x 12-1/4", handle, 1-1/2" MPT, 45 sq ft, PTL45W-P-4, 6CH-45. Freedom Spas section PDF p.18 (printed p.35): same 12-1/4" length, no model names..
Model list attached to 6CH-45 cartridge: Statesman, Lexington, Enterprise, Aristocrat and Franklin, no year range printed, listed by Unicel 2026 Replacement Guide (Unicel Freedom Spas line, 6" x 12-3/8", 45 sq ft. Franklin and Statesman are also on 4CH-30.); Statesman, Lexington, Enterprise, Aristocrat and Franklin, no year range printed, listed by Aladdin Equipment cartridge listing (Aladdin 14506. 6" x 12-3/8", 45 sq ft, 158 pleats. Also names Master Spas.).
Before ordering 6CH-45, compare it with C-4637 differs by Unicel C-4637, Pleatco PRB37-IN-4, Filbur FC-2380, 4-15/16" diameter, 13-5/16" long, top 2-1/8" / open, bottom 2-1/8" / open, 37 sq ft, note says Unicel's Freedom list names Concord, Patriot, Ambassador and Executive on this row only: 4-15/16" x 13-5/16", C-4637, 37 sq ft, 4 oz. The spec table gives 158 pleats, 2-1/8" open ends, and calls 37 sq ft an upgrade of the 25 sq ft C-4326 and C-4625. The brands on that spec line are Rainbow, Waterway, Morgan, Leisure Bay and Custom Molded Products, not Freedom. Filbur's Freedom section calls FC-2380 Rainbow Dynamic 37 and does not print the Concord names. PRB37-IN-4 is Filbur's Pleatco cell.; and 4CH-30 differs by Unicel 4CH-30, Pleatco PTL25P-4, Filbur FC-0141, 4-5/8" diameter, 11-7/8" long, top molded cone handle, 30 sq ft, note says Shown at 30 sq ft because that is Unicel's Freedom Spas line, Unicel's spec table (158 pleats, 4 oz), Filbur's size table and Aladdin 13005. Unicel's Sundance line prints the same 4CH-30 for OEM 6540-484 at 25 sq ft, and Filbur's Sundance line does too. Unicel names Franklin, Statesman and Revere. Aladdin's model field uses that same string and lists Freedom among many brands, including Dimension One and Sundance. Pleatco's Unicel cross-reference does not list 4CH-30; PTL25P-4 is Filbur's Pleatco cell..
Left blank on purpose: Length 12-3/8" (Unicel, Aladdin) vs 12-1/4" (Filbur). Franklin and Statesman are also on the 4CH-30 row. No Freedom OEM number. PTL45W-P-4 is Filbur's Pleatco cell..
Source locations for this Freedom Spas row: Unicel 2026 Replacement Guide on 6CH-45 (Freedom Spas line, PDF p.35 (printed p.31): Statesman, Lexington, Enterprise, Aristocrat, Franklin = 6CH-45, 6" x 12-3/8", 45 sq ft; spec table PDF p.12 (printed p.8): 158 pleats, 3 oz, semi-circular handle, 1-1/2" MPT). Filbur Catalog & Reference Guide on 6CH-45 (Dimensional listing PDF p.10 and Freedom Spas section PDF p.18 (printed p.35): FC-0330 at 6" x 12-1/4", 45 sq ft, PTL45W-P-4). Aladdin Equipment on 6CH-45 (Cartridge 14506, fetched 2026-11-06: model field Statesman/Lexington/Enterprise/Aristocrat/Franklin; 45 sq ft; 158 pleats; 6" x 12-3/8"; Freedom Spas and Master Spas).
Hot tubs listed for this cartridge
The rest of the Freedom Spas model list is the Freedom Spas filter by model and year lookup.
| Model / system | Years | Listed by |
|---|---|---|
| Statesman, Lexington, Enterprise, Aristocrat and Franklin (Unicel Freedom Spas line, 6" x 12-3/8", 45 sq ft. Franklin and Statesman are also on 4CH-30.) | not given | Unicel 2026 Replacement Guide |
| Statesman, Lexington, Enterprise, Aristocrat and Franklin (Aladdin 14506. 6" x 12-3/8", 45 sq ft, 158 pleats. Also names Master Spas.) | not given | Aladdin Equipment cartridge listing |
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.
Other Freedom Spas cartridges
- C-4637 cartridge, 4-15/16" (125 mm) × 13-5/16" (338 mm)
- 4CH-30 cartridge, 4-5/8" (117 mm) × 11-7/8" (302 mm)
All 6 Freedom Spas spa filters
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.
Unicel 6CH-45 Listing we opened and checked. Match the diameter, length and both fittings on this page before you order. The price is on Amazon; we do not print one.
Sources
- Unicel 2026 Replacement Guide: Freedom Spas line, PDF p.35 (printed p.31): Statesman, Lexington, Enterprise, Aristocrat, Franklin = 6CH-45, 6" x 12-3/8", 45 sq ft; spec table PDF p.12 (printed p.8): 158 pleats, 3 oz, semi-circular handle, 1-1/2" MPT (PDF)
- Filbur Catalog & Reference Guide: Dimensional listing PDF p.10 and Freedom Spas section PDF p.18 (printed p.35): FC-0330 at 6" x 12-1/4", 45 sq ft, PTL45W-P-4 (PDF)
- Aladdin Equipment: Cartridge 14506, fetched 2026-11-06: model field Statesman/Lexington/Enterprise/Aristocrat/Franklin; 45 sq ft; 158 pleats; 6" x 12-3/8"; Freedom Spas and Master Spas (web page)
Not in sources: Length 12-3/8" (Unicel, Aladdin) vs 12-1/4" (Filbur). Franklin and Statesman are also on the 4CH-30 row. No Freedom OEM number. PTL45W-P-4 is Filbur's Pleatco cell..