Freedom Spas spa filters

Unicel’s Freedom Spas list puts Franklin, Statesman and Revere on the 30 sq ft 4CH-30, and Statesman, Lexington, Enterprise, Aristocrat and Franklin on the 45 sq ft 6CH-45. Franklin and Statesman are on both, and Filbur prints 6CH-45 an eighth of an inch shorter than Unicel.

Liberty is named only on the short open 35 sq ft cartridge. Two later rows, 50 sq ft C-4405 and 50 sq ft C-4950, have no model name and the note “Model dated after 1993.” Concord, Patriot, Ambassador and Executive are named only on the 37 sq ft C-4637. The full list and the Filbur disagreements are on the Freedom Spas filter page.

This page lists 6 Freedom 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 6 of them (5 hot tub models in total). 6 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.

• 4CH-304CH-30, 4-5/8" (117 mm) × 11-7/8" (302 mm)See replacement
• 6CH-456CH-45, 6" (152 mm) × 12-3/8" (314 mm)See replacement
• C-4401C-4401, 4-15/16" (125 mm) × 4-5/8" (117 mm)See replacement
• C-4405C-4405, 4-15/16" (125 mm) × 6-5/8" (168 mm)See replacement
• C-4637C-4637, 4-15/16" (125 mm) × 13-5/16" (338 mm)See replacement
• C-4950C-4950, 4-15/16" (125 mm) × 13-5/16" (338 mm)See replacement

Know your model but not the part number? See Freedom Spas filter by model and year.

3 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 Freedom Spas

• Beachcomber, same part numbers C-4401, C-4405, C-4950
• Sundance, same part numbers 4CH-30, C-4950
• Bullfrog, same part number C-4950
• Cal Spas, same part number C-4950
• Caldera, same part number C-4950

Guides that apply to Freedom Spas

• Freeflow filter by model, filed separately by Unicel
• Why 37 and 50 sq ft can share one length
• 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

Model-year fitment comes only from the sources named on each cartridge page. Where no source lists models or years, the page says so.