Unicel C-8425 250 sq ft Replacement Pool Filter Cartridge

The Unicel C-8425 is a high-capacity, OEM-grade replacement filter cartridge built for many large residential pool filter systems — including popular models from Jandy (e.g. CS250 / R0462500) and equivalent systems. With a large media area and robust construction, it helps maintain clean, clear water while reducing cleaning frequency.

Key Features

• 250 sq ft filtration area — large surface for superior debris and fine particulate capture.
• Approximately 250 pleats — maximizes usable surface area and improves filter efficiency.
• Constructed with heavy-duty polyester filter media — resistant to pool chemicals and repeated cleanings.
• Open 4″ top and bottom end caps with molded gaskets — ensures proper sealing and easy installation in compatible tanks.
• Deep cartridge length and wide diameter — designed for high-volume, high-flow pool systems requiring larger filtration capacity.

Specifications

• Manufacturer: Unicel
• Part Number: C-8425
• Filtration Area: 250 square feet
• Pleat Count: ~250
• Outer Diameter: 8-15/16″ (approx. 8.94″)
• Length: 33-1/8″ (approx. 33.12″)
• Top & Bottom Ends: Open with 4″ molded gasket seals
• Media Type: Heavy-duty polyester cartridge media
• Intended Use: Large pool filter tanks (e.g. Jandy CS250 or equivalent) requiring a 250 sq ft cartridge

Why Choose the C-8425

For pool owners running larger pools or heavy-use systems, the C-8425 delivers superior debris-holding capacity and longer intervals between cleanings compared to smaller cartridges. Its robust construction and high pleat count make it well-suited to high flow and high demand applications — helping maintain water clarity and reducing strain on your filtration system.

Maintenance & Replacement Tips

• Rinse the cartridge every 2–4 weeks (or when filter pressure rises) to extend media life and maintain flow.
• Deep-clean with a cartridge-safe cleaning solution periodically to remove oils, lotions, and buildup that regular rinsing can’t remove.
• Inspect end caps and gaskets during each cleaning cycle — replace the cartridge if the media pleats start to collapse, or if gaskets show cracking/wear.
• Rotate between two cartridges if possible — this allows one to dry/cure between uses and can extend overall lifespan while maintaining consistent filtration performance.

When to Replace

Install a new C-8425 cartridge when the existing filter shows signs of reduced flow that cannot be corrected with cleaning, the pleats are deformed or oily buildup won’t rinse out, or when gaskets fail to seal properly. A fresh cartridge restores proper filtration efficiency and helps preserve pump pressure and water circulation.