C-5345 | Unicel Rec Warehouse S2/G2 Spa Cartridge | 45 Sq. Ft

The Unicel C‑5345 cartridge is a high-quality 45 sq ft replacement filter tailored for Rec Warehouse S2/G2 spa systems, including Rainbow and Waterway models. Made with robust spun-bonded polyester media and featuring approximately 230 pleats, it enhances dirt-trapping efficiency and extends filter life. Measuring 5 5/16″ in diameter and 10 1/8″ in length, with open 2 1/8″ inner-diameter end caps, it’s designed for direct interchangeability with OEM units. Engineered for straightforward drops-in and excellent flow characteristics, the C‑5345 keeps your spa crystal-clear with minimal maintenance required.

Highlights

• Optimized 45 sq ft Filtration Capacity: Offers a substantial surface area with around 230 pleats, resulting in superior dirt-holding ability and longer operation between cleanings.

• Professional-Grade Polyester Media: Built with heavy-duty, chemical-resistant spun-bonded polyester for reliable, long-term use in spa environments.

• Precision Sizing for Direct Fit: Dimensions—5 5/16″ diameter, 10 1/8″ length, open 2 1/8″ inner-diameter end caps—are engineered to mirror OEM designs for hassle-free replacement.

• Versatile Cross-Brand Compatibility: Compatible with Rec Warehouse S2/G2, Rainbow, and Waterway spa systems, delivering easy integration across multiple platforms.

• Efficient Hydraulic Performance: Thoughtfully engineered pleat structure promotes smooth water flow and effective filtration, helping maintain pump efficiency and water clarity.

Specification

• Outside Diameter: 5-5/16″
• Length: 10-1/8
• Inner-Diameter: 2 -1/8″

Additional Info

Need help with the Unicel C-5345 45 sq ft spa filter cartridge for Rec Warehouse S2/G2, Rainbow, or Waterway systems? This section covers installation, compatibility, and troubleshooting, with advice on confirming details in store.

Installing the C-5345 Spa Cartridge

This cartridge drops directly into compatible spa housings with 2 1/8″ open ends. Proper seating ensures secure operation and clean, clear spa water.

How do I install the C-5345 into my Rec Warehouse S2 spa filter?

Why doesn’t the new cartridge seat evenly in the housing?

Can I buy the Unicel C-5345 cartridge in store today?

Do I need to clean the spa filter housing before installing this cartridge?

Confirming Compatibility With Spa Models

The C-5345 matches Rec Warehouse S2/G2, Rainbow, and Waterway systems. Verifying size and part number before purchase ensures correct fit.

Does the C-5345 replace OEM cartridges in Rainbow spa filters?

How do I confirm in store that my spa uses this 45 sq ft cartridge?

Can store staff compare my old filter with the Unicel C-5345?

Will the C-5345 also fit Waterway spas sold locally?

Troubleshooting Filtration Performance

If water stays cloudy or flow decreases, the filter may be clogged or incorrectly seated. Replacing with a fresh C-5345 restores water clarity.

Why is my spa still dirty after installing the C-5345 cartridge?

How often should I rinse or replace this 45 sq ft filter?

What should I do if pressure rises quickly after adding the new cartridge?

Can I bring my old filter to the store to confirm sizing?