Freedom Spas spa filter (C-4950)

Freedom Spas

Replacement numbers

Unicel C-4950, Pleatco PRB50-IN

Fits Freedom Spas.

Diameter 4-15/16" (125 mm)Length 13-5/16" (338 mm)50 sq ft1 model listed

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. Check price on Amazon opens the Unicel C-4950 listing we checked. These are affiliate links. Product photos are omitted unless Amazon supplied one through the Product Advertising API or a SiteStripe image link. Verify dimensions before ordering. Each “Check price on Amazon” button opens a specific listing whose title we checked. The line under the name repeats only that title. See our affiliate disclosure.

UnicelC-4950
PleatcoPRB50-IN (Unicel cross-reference PDF p.47: C-4950 = PRB50-IN.)
FilburFC-2390
Top2-1/8" (54 mm) / open
Bottom2-1/8" (54 mm) / open
Ø 4-15/16" (125 mm)13-5/16" (338 mm)Side view · end views belowTopBottom
Top: 2-1/8" (54 mm) / open
Bottom: 2-1/8" (54 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. 50 sq ft media.

Request a filter replacement reminder

This stores a request for this filter: the model, the date you installed it, and how often you replace it. Submitting stores the request and does not send email.

We'll only use your email for this request.

Deletion requests go only to the address on the privacy page.

For Freedom Spas, C-4950 cartridge sits in Freedom Spas. The cross-reference prints Unicel C-4950; Pleatco PRB50-IN; Filbur FC-2390. 4-15/16" across, 13-5/16" long, top 2-1/8" / open, bottom 2-1/8" / open, 50 sq ft.

Catalog note for PRB50-IN: Unicel's Freedom block ends with this 50 sq ft row and a blank model cell. The note "Model dated after 1993" is under this row. Filbur repeats the note on FC-2390 and calls the row Rainbow Dynamic 50. The same open cartridge is used by other brands. Not indexed: no Freedom OEM number and no model name.

C-4950 (OEM C-4950 cartridge), Pleatco side: Unicel cross-reference PDF p.47: C-4950 = PRB50-IN..

PRB50-IN, Filbur note: Freedom Spas section PDF p.18 (printed p.35): FC-2390, Rainbow Dynamic 50, "Model dated after 1993", C-4950, 50 sq ft..

Model list attached to C-4950 cartridge: Not named, years Model dated after 1993, listed by Unicel 2026 Replacement Guide (Unicel prints the note under this blank-model row. Filbur repeats it on Rainbow Dynamic 50.).

C-4950 is easy to confuse on the Freedom Spas table. C-4637 differs by Unicel C-4637, Pleatco PRB37-IN-4, Filbur FC-2380, 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.. 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, bottom 1-1/2” male thread/MPT, 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: No model name. The 1993 note is not attached to the Concord names on C-4637. Duplicate of C-4950 rows under other brands..

Where those figures are printed: Unicel 2026 Replacement Guide on C-4950 (Freedom Spas line, PDF p.35 (printed p.31): blank model cell, C-4950, 4-15/16" x 13-5/16", 50 sq ft, 3 oz, note "Model dated after 1993" under the row). Pleatco 2023 Catalog on C-4950 (Unicel cross-reference PDF p.47: C-4950 = PRB50-IN). Filbur Catalog & Reference Guide on C-4950 (Freedom Spas section PDF p.18 (printed p.35): FC-2390, Rainbow Dynamic 50, same 1993 note).

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 / systemYearsListed by
Not named (Unicel prints the note under this blank-model row. Filbur repeats it on Rainbow Dynamic 50.)Model dated after 1993Unicel 2026 Replacement Guide

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-4950 number is also on the Caldera, Jacuzzi, Sundance, Beachcomber, Coleman Spas pages.

Other Freedom Spas cartridges

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

Sources

Not in sources: No model name. The 1993 note is not attached to the Concord names on C-4637. Duplicate of C-4950 rows under other brands..