Darlly Spa and Pool Filter Cartridge [11001] CS100XRE C8408 For Hayward Bottom Open

The Darlly Spa/Pool Replacement Filter Cartridge 11001 (CS100XRE), also listed as C-8408, is a high-capacity replacement designed to fit Hayward spa and pool filtration systems. Engineered for reliability, it delivers strong dirt-holding capability while preserving steady, clean water flow.

Key specifications

• Manufacturer: Darlly Filtration
• Manufacturer part number: 11001
• Replaces: FC-1265, C-8408
• Model: SwimClear C100S
• Media: 4 oz filtration media
• Filtration area: 130 sq ft
• Dimensions: Top 4" | Bottom 4" | Outside diameter 10-1/8" | Length 19-1/2"
• Top/Bottom style: Open (both ends)
• Application: Hayward bottom-style filtration housings

Why this cartridge stands out

With 130 square feet of filtration area and a 4 oz media bed, this Darlly cartridge delivers substantial surface area for trapping dirt, oils, and fine particles, helping your spa or pool stay clearer longer between cleanings. The open-top and open-bottom design simplifies installation and servicing, ensuring a reliable seal and consistent flow through your filter housing. Its precise 10-1/8" diameter and 19-1/2" length fit a wide range of Hayward bottom-style systems, making it a practical cross-reference for many spa and pool setups.

Who is it for?

Ideal for pool and spa owners who need a dependable cross-reference replacement for FC-1265 or C-8408, especially when your system uses a bottom-open cartridge. This cartridge is well-suited for mid-to-large filtration duties thanks to its 130 sq ft effective filtration area. It’s also a solid choice for service technicians stocking versatile replacements that cover multiple Hayward-style housings.

Maintenance tips

• Rinse with a garden hose to remove loose debris; avoid high-pressure jets that could damage the media.
• Inspect seals and end caps during replacements to ensure a proper, watertight fit.
• Replace when flow drops or pressure rises, or after extended service intervals based on usage.
• Store dry and avoid crushing the cartridge to preserve its 4 oz media bed.

How it compares to alternatives

This Darlly SwimClear C100S cartridge emphasizes a balance between capacity and compatibility. While many replacements share similar dimensions, the 4 oz media and 130 sq ft filtration area provide meaningful dirt-holding capacity within a compact 10-1/8" diameter form factor. The open-ended design reduces bypass risk and simplifies alignment in Hayward bottom-style housings, helping you maintain clearer water with fewer cartridge changes.