Unicel C-5423 Filter Cartridge

Part Number: C-5423

Description

This filter cartridge offers 34 sq ft of surface area and is designed for use in specific hot tub and spa systems that require a 5.187″ diameter by ~11.9″ length cartridge with closed top and 1.625″ open bottom. It’s constructed of high quality pleated media to capture debris and maintain water clarity.

Compatibility & Fitment

• Fits spa filter applications requiring the former OEM part 20045 or 370-0215 for brands such as Marquis Spas. :contentReference[oaicite:0]{index=0}
• Dimensions: approx. 5 3/16″ outside diameter × 11 15/16″ length; top end cap closed; bottom inner diameter ~1 5/8″. :contentReference[oaicite:1]{index=1}
• Media area: approximately 34 sq ft. :contentReference[oaicite:2]{index=2}

Features & Specifications

• 34 sq ft of filtration area to provide enhanced debris capture compared to smaller cartridges. :contentReference[oaicite:3]{index=3}
• Pleat count of about 158 for increased surface area and better flow. :contentReference[oaicite:4]{index=4}
• Durable pleated media with closed top cap and open bottom design for proper flow alignment in compatible filter housings.

Installation Notes

Turn off power and isolate circulation before removing the old cartridge. Remove the filter housing cover, extract the old cartridge, clean inside the housing of debris, inspect O-rings for wear, and insert the C-5423 ensuring correct orientation (closed top up, open bottom down). Re-assemble, pressurize the system, and check for normal pressure rise and flow.

Maintenance Tip

Clean the cartridge periodically (for example every 4–6 weeks) using a filter wash solution, then rinse thoroughly. Replace the cartridge when cleaning no longer restores proper pressure drop or flow is degraded. A high-quality cartridge like the C-5423 can help maintain optimal water clarity and reduce chemical usage over its service life.

SKU: C-5423