Unicel C-7375 Replacement Filter for Caldera Spas 72828 | 75 Sq. Ft.

Name: Unicel C-7375 Replacement Filter for Caldera Spas 72828 | 75 Sq. Ft.
Brand: Unicel
SKU: UNFC7375
Price: 57.07 USD
Availability: InStock

$57.07 USD

Shipping calculated at checkout.

Overview

The Unicel C-7375 is a pleated polyester spa cartridge filter element providing 75.0 sq ft of filtration area, engineered as a direct OEM replacement for Caldera Spas filter model 72828. The element features Reemay nonwoven polyester media with nominal 15-micron filtration efficiency, supported by injection-molded ABS end caps in a closed-bottom, open-top SAE-thread configuration consistent with Caldera's threaded standpipe manifold design. Internal core construction is rated for the pressure range of residential spa circulation systems (typical 5–15 PSI operating). Maximum continuous service temperature: 104°F, with intermittent excursions to 120°F acceptable per Unicel testing protocol. The 75 sq ft media pack delivers substantial dirt-holding capacity suited to high-bather-load spa applications and extended service intervals between chemical cleanings.

Service interval recommendation: rinse with fresh water every 2–4 weeks under normal residential spa use; chemical soak with dilute TSP or commercial enzyme/degreaser every 4–6 weeks to remove oils, lotions, and surfactant residue that resist water rinsing. Replace at ≤ 12-month intervals under typical use, or earlier when ΔP exceeds 5 PSI above clean-filter baseline, when visual inspection reveals pleat collapse or fabric tears, or when chemical cleaning no longer restores flow. Chemical compatibility: polyester fabric and ABS end caps tolerate continuous service at ≤ 10 ppm free available chlorine or ≤ 30 ppm total bromine; muriatic acid soak at 1:20 dilution is compatible for calcium scale removal (20-minute maximum exposure, followed by thorough freshwater rinse). Verify ozone compatibility before deployment in ozone-primary sanitization systems. Standard Unicel 90-day manufacturer's defect warranty applies through authorized distribution channels.

What's Included

Your order includes the selected quantity of replacement spa filter cartridges. Each unit is individually inspected for quality before shipping.

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Product Specs

Product SKU	C-7375
Replaces OEM	72828
Filter Model	Caldera 72828
Filtration Area	75
Length	14-3/4"
Outer Diameter	7"
Center Hole	2-11/16"
Media	3 oz
Endcap Material	Durable Polyurethane
Pleat Count	216
Pack Options

Compatibility Table

Brand	Part Number	Type	Status
Unicel	C-7375	OEM-Compatible	Compatible
Caldera Spas	72828	OEM Original	OEM
Pleatco	PCD75N	Aftermarket	Compatible
Filbur	FC-3964	Aftermarket	Compatible
Other	OC-714D	Aftermarket	Compatible

Unicel C-7375 Replacement Filter for Caldera Spas 72828 | 75 Sq. Ft.

$57.07 USD

Verify Your Fit

How to Measure

Confirm all three dimensions match your existing cartridge before ordering.

Length

14-3/4" — top endcap to bottom

Outer Diameter

7" — widest point across

Center Hole

2-11/16" — inside of the hole

Frequently Asked Questions

Still have questions? Our knowledgeable support agents are standing by to help.

Contact Support

What if it doesn't fit?

We back every order with an exact-fit guarantee. If it doesn't fit your filter housing, contact us within 30 days for a full refund or exchange — no hassle, no restocking fee. Call or text (732) 395-2225.

How long will these last?

With regular cleaning, expect 1–2 seasons of use. Rinse with a garden hose every 4–6 weeks, and do a deep soak in filter cleaner once or twice a season. Replace when you see collapsed pleats, tears in the media, or pressure stays high after a fresh clean.

How do I confirm this fits before I order?

Measure your existing cartridge in three spots: length end-to-end, outer diameter at the widest point, and the inner diameter of the center hole. If all three match the specs listed above, it's a direct fit.