Unicel 5CH-752 | 75 sq ft Cal Spas Filter Cartridge

• 75 square feet from a 5-3/16" diameter: Wide-body capacity in a narrow-body cartridge, achieved through height and pleat density rather than girth — so it fits filter wells that larger cartridges cannot.
• 194 pleats: Sharp, uniform folds that multiply usable surface area across the cartridge's full 16-1/8" height.
• 3 oz Reemay 2033 media: Spunbonded one hundred percent polyester with strong chemical resistance, balancing dirt-holding capacity against cleanability so the cartridge recovers well through repeated wash cycles.
• Approximately 20-micron filtration: Captures the fine suspended particles responsible for cloudy, hazy water.
• Threaded 2" MPT bottom connection: Screws directly onto the suction fitting so every drop entering the pump has passed through the media. No bypass path exists by design.
• Closed bar-handle top: A rigid grip bar spanning the sealed top cap, giving a firm two-finger hold for threading the cartridge on and lifting it out without touching or crushing the pleats.
• Solid injection-molded core: Runs the full 16-1/8" length to resist the flexing and collapse that tall, slender cartridges are otherwise prone to under sustained suction.
• Chemical-resistant end caps: Molded to hold thread geometry and pleat alignment through years of chlorine, bromine, and high water temperature.
• Made in the USA: Manufactured by Meissner Manufacturing to meet or exceed OEM specification.

The cartridge threads onto a suction fitting at the base of the filter well and stands upright. When the pump runs, it draws water from inside the core, creating lower pressure there than in the surrounding spa water. That difference pulls water inward through the pleated media from every direction at once, across the full circumference and the entire 16-1/8" height. Filtered water travels down the hollow core, through the threaded fitting, and into the suction plumbing.

Particles are captured in the depth of the polyester fibers rather than merely on the surface, which is why a cartridge that still looks reasonably clean can already be substantially restricted — most of the accumulated material sits inside the fabric, not visibly on it. Declining jet pressure is the most reliable early signal that a cleaning is overdue.

The geometry here creates a specific consequence worth understanding. Packing 194 pleats around a 5-3/16" cartridge means roughly 16 inches of circumference has to accommodate all of them, so the gaps between folds are narrower than on a wide-body cartridge of the same capacity. Narrow gaps are what make the capacity possible, and they are also what make debris cling. This cartridge rewards a careful rinse and punishes a hurried one more than a fatter filter would.

Loading is also uneven along its height. On a tall cartridge threaded at the bottom, suction is strongest nearest the fitting, so the lower portion draws proportionally more water and collects proportionally more debris. The top few inches often still look nearly new when the bottom third is packed — which is precisely why judging cleanliness by the part you can see from above is unreliable.

Pro Tip: When you rinse, spend most of your time on the bottom third and use a fan or fingertip nozzle rather than an open hose. Two things are working against you at once on this cartridge: the pleat gaps are tight because of the narrow diameter, and the heaviest loading is concentrated at the end nearest the threaded fitting. A wide, unfocused stream washes over the tops of the folds without ever reaching into them, and most people instinctively rinse the part at eye level hardest — which is the cleanest part. Angle the spray down into each gap, rotate steadily, and work the bottom deliberately.

Installation

1. Turn the spa off at the breaker before opening the filter compartment. Never unthread a cartridge with the pump running.
2. Remove the filter lid, grip the bar handle, and turn counterclockwise to unthread the old cartridge. Lift it out slowly and let it drain — a loaded 16" cartridge carries a surprising amount of water and debris, and yanking it out dumps that load straight back into the well you are about to put a clean filter into.
3. Inspect the suction fitting at the bottom of the well. Clear away hair, grit, and debris, and check that the threads are clean and undamaged.
4. Lower the new cartridge in and seat it onto the fitting. Turn counterclockwise first until you feel the threads drop into alignment, then reverse and turn clockwise to thread it on.
5. Tighten until you feel resistance, then stop. Hand pressure on the bar handle only — no wrench, no pliers, no tools of any kind.
6. Confirm the cartridge stands straight and does not rock or lean. A leaning cartridge means it is cross-threaded or not fully seated — back it out and start again.
7. Replace the lid, restore power at the breaker, and run a full circulation cycle.
8. Verify normal jet pressure and flow. A clear improvement over the old cartridge is expected.

Routine Cleaning

• Every 2 to 4 weeks: Unthread and rinse with a garden hose using a fan or fingertip nozzle. Work around the full circumference from top to bottom, angling the spray down into the pleats, and give the bottom third the most attention. On a cartridge this tall with pleats this tight, a thorough rinse takes several minutes — the time is the point.
• Every 3 months: Deep-soak in a dedicated spa filter cleaning solution to dissolve the body oils, lotion residue, and mineral scale that no amount of rinsing will remove. Rinse thoroughly afterward — cleaner left in tight pleats is a common and entirely preventable cause of persistent foaming.
• At every drain and refill: Deep-clean the cartridge before it goes back into fresh water. Installing a loaded filter into a freshly filled spa gives back most of the benefit of the refill.
• Inspect the threads at every cleaning. Run a fingertip over them. Rounded, chipped, or deformed threads mean the cartridge can no longer seal reliably.
• Rotate two cartridges if you can: A spare lets you install the clean one immediately while the other dries completely. A fully dried cartridge releases trapped debris far more easily on the next rinse — an advantage that compounds when the pleats are tightly spaced — and rotating roughly doubles the useful life of both.

Important Cautions

• Do not use a pressure washer. High-pressure spray tears media fibers and destroys pleat geometry, often without visible damage, and torn media passes unfiltered water straight through.
• Do not use a wrench, pliers, or any tool on the threaded connection, and do not use the bar handle as a lever against a stuck cartridge. If it will not turn, work it gently back and forth rather than applying force — the handle will snap or the end cap will crack well before a truly seized thread lets go.
• Do not clean with dish soap, laundry detergent, or household cleaners. These leave residues that foam persistently and are very difficult to rinse out.
• Do not run the spa without a cartridge threaded on. On a top-load system this leaves the suction line completely open, and debris pulled directly into the pump can cause damage costing far more than a cartridge.
• Do not boil, bleach, or machine-wash the cartridge.

When to Replace

Replace the cartridge when you see torn or separated media, cracked end caps, damaged or stripped threads on the bottom connection, a cracked or loose bar handle, a soft or collapsing core, pleats that have permanently lost their shape or matted together, staining that no longer responds to a deep soak, or a persistent drop in flow that thorough cleaning no longer restores. On a threaded cartridge, thread damage is an immediate replacement regardless of how good the media still looks — compromised threads cannot seal, and a cartridge that cannot seal defeats the purpose of a top-load design. On a tall cartridge, also watch for a visible bow or lean when it is stood upright, which indicates the core has begun to soften. Most spa owners under typical use replace every 12 to 18 months.

• Brand: Unicel
• Manufacturer: Meissner Manufacturing Co., Inc.
• Part Number: 5CH-752
• Product Type: Replacement spa filter cartridge, top load
• Filtration Area: 75 sq. ft.
• Pleat Count: 194
• Filter Media: 3 oz. Reemay 2033 spunbonded polyester
• Micron Rating: Approximately 20 microns
• Outer Diameter: 5-3/16"
• Length: 16-1/8"
• Top End Cap: Closed, with bar handle
• Bottom End Cap: 2" male thread / MPT
• Core: Solid injection-molded, full-length
• End Cap Material: Chemical-resistant molded plastic, exact OEM fit
• Replaces OEM: Cal Spas 50753
• Cross-References: Filbur FC-0202, Pleatco PCAL60-F2M, Darlly 50753
• Quantity Per Spa: Typically one; verify your filter compartment configuration
• Typical Service Life: 12 to 18 months with routine cleaning
• Cleaning Method: Hose rinse every 2 to 4 weeks using a fan nozzle; chemical soak every 3 months. Do not pressure wash.
• Installation: Hand-tighten only. Do not use tools, and do not lever against the bar handle.
• Not Compatible With: Wells using a thread size other than 2" MPT, slip-fit wells, and open-ended drop-in configurations
• Origin: Made in the USA
• Shipping: Standard ground; not classified as a hazardous material

Replaces This OEM Part Number

• Cal Spas 50753

Cross-Reference Part Numbers

• Filbur FC-0202
• Pleatco PCAL60-F2M
• Darlly 50753

Spa Brands Using This Cartridge

• Cal Spas — including the Victory 60
• Some retailers also list this cartridge as fitting select Marquis Spas models; verify against your own cartridge before ordering on that basis

A Note on the "60" in the Part Names

Cal Spas designates this the Cal Spa 60, and the equivalent Pleatco cartridge is PCAL60-F2M — yet Unicel rates the cartridge at 75 square feet. Both numbers describe the same physical filter. Manufacturers measure and rate filtration area using different internal conventions, and the figures embedded in aftermarket part names do not always correspond to a directly comparable measurement. If you have been shopping by the "60" and are wondering whether a 75 is something larger, it is not — check the dimensions and the connection, which are what actually determine fit.

How to Confirm Fitment

Verify all four against your existing cartridge before ordering:

• Bottom connection: A 2" male pipe thread (MPT). A 1-1/2" MPT, an SAE thread, a slip fitting, or an open unthreaded end is a different cartridge entirely, and the threads will not engage.
• Top style: A closed cap with a bar handle — not an open end, not a molded cone handle, not a semicircular handle.
• Overall length: 16-1/8", measured end cap to end cap and excluding the threaded fitting.
• Outer diameter: 5-3/16".

Pro Tip: Be especially careful here if you own a Cal Spa. Cal Spas has used a wide range of different filter sizes across its models and production years — more variation than most manufacturers — so knowing you have a Cal Spa tells you very little about which cartridge you need. Model name and year are not reliable guides, and neighbors with the same model can genuinely take different filters. Match the part number molded into the end cap of your existing cartridge, or measure all four specifications above. If the label has worn off, which is common after a few years in hot water, our team can identify the correct cartridge from your spa's serial number.