Unicel C-4950 | 50 sq ft Jacuzzi J-200 Filter

By Unicel
SKU: C-4950
$48.99

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Check out the Filter Guide to see if this filter fits your hot tub model.

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Description

TheĀ Unicel C-4950Ā is a direct replacement for theĀ JacuzziĀ® J-200 Series 373045Ā filter, deliveringĀ 50 square feetĀ of filtration acrossĀ 212 uniform pleats. Built toĀ meet or exceed OEM specifications, it's the kind of replacement that performs like the original — and often outlasts it.

Filtration is the quiet backbone of clean spa water. Every soak leaves behindĀ body oils, lotions, hair, and fine debris, and the cartridge is what removes all of it before it clouds the water, feeds bacteria, or coats your plumbing. When a filter is worn or clogged, the effects spread everywhere: dull water, higher chemical use, softer jets, and aĀ pump and heater strainingĀ against restricted flow.

What separates a Unicel from a bargain cartridge is what it's built from. The media isĀ ReemayĀ® polyester — a trilobal fiber whose three-lobed shape presents substantiallyĀ more surface areaĀ than standard rounded fibers, giving the filter higher dirt-holding capacity andĀ more time between cleanings. AddĀ chemical-resistant end capsĀ with an exact OEM fit,Ā uniform pleatsĀ spaced for optimal flow, and aĀ solid coreĀ that won't collapse under pressure, and you get a cartridge that holds its shape and its performance through cleaning after cleaning. Made in the USA.

Pro Tip:Ā Uniform pleat spacing is what makes a filter easy to clean. When pleats are packed unevenly, debris wedges into the tight spots and a hose stream can't reach it — so the cartridge never really comes clean and flow keeps dropping. Evenly folded pleats let water get all the way to the base of each fold, which is why a well-built filter rinses out properly and keeps performing.

Brand

UNICELĀ®

Key Features
  • 50 sq ft of filtration — full OEM-spec filtration area across 212 pleats
  • Reemay polyester media — trilobal fibers deliver more surface area and higher dirt-holding capacity
  • More time between cleanings — greater capacity means fewer trips to the hose
  • Chemical-resistant end caps — exact OEM fit, built to resist degradation
  • Solid core — maintains structural integrity and optimized flow under pressure
  • Made in the USA — built to meet or exceed OEM standards
How It Works

Water is drawn through the cartridge's pleated media as your spa circulates.Ā Pleating creates the capacity: folding the fabric into 212 pleats packsĀ 50 square feetĀ of filtering surface into a cartridge about 5 inches across and 13-5/16 inches tall. More surface means water passes throughĀ more slowly and thoroughly, capturing finer particles, and it means the filter holds far more debris before flow starts to drop off.

The fiber shape is whereĀ ReemayĀ media earns its reputation. Standard filter fibers are round; Reemay's areĀ trilobal — three-lobed in cross-section — which packs considerably more surface area into the same amount of material. More surface area per fiber means more places for dirt to be captured, and aĀ smooth media surfaceĀ that releases that dirt readily when you rinse it. The result is a cartridge that filters well, cleans easily,Ā resists chemical degradation, and holds up to repeated cleanings.

Pro Tip: A clean filter protects your equipment, not just your water. As the pleats load up with body oils, your pump has to work harder against the restriction, and reduced flow across the heater can trigger flow-related errors. Regular rinsing and periodic deep cleaning is the cheapest protection there is for the expensive parts of your spa.

Directions for Use

Installation

  1. Turn off power to the spa at the breaker before servicing the filter compartment.
  2. Open the filter lid and clear any debris from the compartment.
  3. Remove the old cartridge, noting its orientation.
  4. Seat the new cartridge squarely in the filter well, fully seated top and bottom.
  5. If your spa uses more than one cartridge,Ā replace them at the same timeĀ so they wear evenly.
  6. Close the lid, restore power, and run the circulation to confirm normal flow.

Routine Cleaning

  1. Every two to four weeks:Ā remove the cartridge and spray it thoroughly with a garden hose, working between the pleats from top to bottom. AĀ soft brush cleaning toolĀ helps.
  2. Periodically:Ā soak or treat the cartridge with a dedicated filter cleaner to dissolve the body oils and buildup a rinse can't remove, then rinse it off.
  3. Let it dry fullyĀ before returning it to service whenever possible.

When to Replace

  • The cycle between cleanings gets noticeablyĀ shorter
  • Low water flowĀ or high differential pressure
  • The media has aĀ tear
  • TheĀ center core collapses

Cartridge life depends on routine maintenance and your spa's water chemistry.

Pro Tip: Keep a spare cartridge in rotation. A proper chemical soak takes hours, and the filter cleans best when it can dry completely afterward — awkward when your spa needs it back right away. With a second cartridge you can drop in a clean one immediately and service the other on your own schedule, so your spa never runs on a dirty filter and both last longer.

Specifications
  • Brand:Ā Unicel (Meissner Mfg. Co., Inc.)
  • Part Number:Ā C-4950
  • Replaces OEM:Ā Jacuzzi J-200 Series 373045
  • Product Type:Ā Replacement spa filter cartridge
  • Filtration Area:Ā 50 sq ft
  • Pleat Count:Ā 212
  • Media:Ā Reemay polyester, 3 oz basis weight
  • Diameter:Ā 4-15/16 in
  • Length:Ā 13-5/16 in
  • Top End Cap:Ā Open, 2-1/8 in inner diameter
  • Bottom End Cap:Ā Open, 2-1/8 in inner diameter
  • End Caps:Ā Durable plastic, chemical-resistant, exact OEM fit
  • Core:Ā Solid core for structural integrity and optimized flow
  • Primary Fitment:Ā Jacuzzi J-200 Series (J-210 2005+, J-220 2005–2008, J-230 2005–2007); also Sundance Spas 680 Series
  • Cross-References:Ā Pleatco PRB50-IN, Filbur FC-2390, Sundance 6540-471, Coleman 100533, Waterway 817-5000, CMP 25391, Pentair R173434, Rainbow RTL-50, Caldera 302005, and more
  • Cleaning:Ā Rinse every two to four weeks; deep clean periodically with filter cleaner
  • Origin:Ā Made in the USA
  • Shipping:Ā Standard ground; not classified as a hazardous material

  • Outer Diameter: 4-15/16"
  • Length: 13-5/16"
  • Top End Cap: 2-1/8" / open
  • Bottom End Cap: 2-1/8" / open
  • Pleat Count: 212
  • Media: 3 oz.
  • Filtration Square Footage: 50 sq. ft
Compatibility

The C-4950 is one of the most widely used cartridge sizes in the spa industry. Its primary fitment is theĀ JacuzziĀ® J-200 Series — replacing OEM partĀ 373045 — covering J-210 models from 2005 forward, J-220 models 2005–2008, and J-230 models 2005–2007. It also fitsĀ SundanceĀ® Spas 680 SeriesĀ models.

It's cross-referenced against a long list of OEM and aftermarket numbers, including:

  • Pleatco:Ā PRB50-IN (also PRB50, PRB50-IN-M)
  • Filbur:Ā FC-2390 (also FC-2390M)
  • Jacuzzi:Ā 373045
  • Sundance Spas:Ā 6540-471
  • Coleman Spas:Ā 100533, 3301-2145
  • Waterway Plastics:Ā 817-5000
  • Custom Molded Products:Ā 25391
  • Pentair:Ā R173434, 17-2380
  • Rainbow:Ā RTL-50, R172380, Dynamic 50
  • Caldera Spas:Ā 302005
  • Others:Ā Baleen AK-3049, Master Spas M007064D4, Beachcomber 3005815, Guardian 413-212-02

Because this size spans so many brands, the surest way to order correctly is toĀ read the part number off your current cartridgeĀ or measure it against the dimensions below, and confirmĀ how many filters your spa takes. For upkeep, pair it with a dedicatedĀ filter cleaner.

Most products purchased from our online shop within the last 30 days are eligible for return. Please review our return policy to see the list of items that cannot be returned.

Some major items that are non-returnable:

  • Gift cards
  • Electronics
  • Pumps / Motors
  • Hot Tubs
  • Closeouts
  • Fireplaces
  • Electric Fireplaces
  • Massage Chairs
  • See return policy below for full list of non-returnables.

UNICELĀ® Brand FAQs

Who makes Unicel filters?

Unicel filters are made byMeissner Mfg. Co., Inc., a family business that began as a small contract sewing operation in thelate 1950sand moved into pool filtration through the 1970s. By the end of that decade the company was producing cartridge filters for the industry'soriginal equipment manufacturers, and in1985it introduced the Unicel brand as aftermarket replacements. It's still owned and operated by the Meissner family today.

Are Unicel filters as good as the original manufacturer's filter?

Unicel builds its cartridges tomeet or exceed original equipment specifications— and that's a meaningful distinction here, because the company produced cartridges for the industry's OEMs before it ever launched its own brand. Unicel cartridges usedurable, chemical-resistant end capswith an exact fit,high-capacity media,uniform pleatsfor optimal flow, and asolid corethat resists collapsing under pressure.

Where are Unicel filters made?

Unicel filters are manufactured inCalifornia, with components sourcedexclusively in the United States. The line comprisesnearly 500 products, covering replacement cartridges, D.E. grids, filter discs, and related parts.

How do I find the right Unicel filter for my spa?

Unicel cartridges areinterchangeable with all major filter brands, and each one cross-references to a list of original equipment part numbers. The most reliable method is topull your current cartridge and read the part number printed on it, then match it to the Unicel cross-reference. If the number has worn off,measure your old cartridge— diameter, length, and the size and style of the openings at each end — and match those instead. Also confirmhow many cartridgesyour spa uses.

How long does a Unicel filter last?

Cartridge life depends on how heavily the spa is used, yourwater chemistry, and how consistently you clean the filter. Many Unicel cartridges useReemayĀ® polyester media, whosetrilobal fibersprovide considerably more surface area than standard rounded fibers — which increases dirt-holding capacity and extends the time between cleanings. With regular rinsing and periodic deep cleaning, a well-maintained cartridge commonly serves a year or more.

When should I replace my filter instead of cleaning it?

Replace the cartridge when thecycle between cleanings becomes noticeably shorter, when you seelow water flowor high differential pressure, when the media has atear, or if thecenter core collapses. Pleats that stay permanently flattened or discolored after a proper cleaning are another sign the cartridge has reached the end of its service life.

About UNICELĀ®

UnicelĀ is the nation's leading manufacturer of replacement filter cartridges for pools and spas — and the story behind it is a genuinely American one. In the late 1950s,Ā Richard T. MeissnerĀ started a small part-time contract sewing operation. Through the 1970s, Meissner Mfg. Co., Inc. moved into swimming pool filter bags, then D.E. grid element covering, and by the end of that decade the company was producingĀ cartridge filters for the industry's original equipment manufacturers.

That's the detail that matters most: Unicel wasĀ building the filters that went into new spas long before it sold a replacement. InĀ 1985, the company introduced the UNICEL brand so dealers and technicians could source elements built to O.E.M. specifications from a single place — even for equipment brands they didn't carry. Today the line spansĀ nearly 500 products, all manufactured inĀ California with components sourced exclusively in the USA.

By staying focused on one thing — filtration — Unicel has built deep expertise in a critical corner of the industry, from media development to cartridge design. Every cartridge is built withĀ chemical-resistant end capsĀ for an exact fit,Ā high-capacity filter media,Ā uniform pleatsĀ for optimal flow, and aĀ solid coreĀ that holds its shape under pressure. Meissner Mfg. Co., Inc. remainsĀ owned and operated by the Meissner family, still recognized for quality and service. American-made products, world-class service.