The Darlly Spa/Pool Replacement Filter Cartridge — Spa Berry (35 sq ft) is your reliable cross-reference for a crystal-clear spa or small pool. Directly replacing Filbur FC-3058 and Unicel 70354, this cartridge is designed to drop into standard filter housings without guesswork, so you can get back to enjoying pristine water faster.
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Filtration area: 35 sq ft of media to capture fine sediment, oils, and debris for noticeably clearer water.
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Bottom design: 2" bottom with an open, twist-lock connection for quick, secure installation and easy removal.
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Top design: Closed Castle top provides a robust seal to minimize bypass and maintain pump efficiency.
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Dimensions: 7-1/8" diameter and 5-7/8" length, fitting common spa and small pool filter housings.
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Media weight: 3 oz of filtration media engineered to balance flow and filtration performance.
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Model note: Spa Berry variant—optimized for compatibility with standard spa filtration systems.
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Cross-compatibility: A convenient replacement for Filbur FC-3058 and Unicel 70354, helping you maintain parts you already know and trust.
Why this cartridge matters in everyday use. The combination of a generous 35 sq ft filtration surface with a compact 7-1/8" diameter means strong filtration without sacrificing flow. The open bottom with twist-lock makes alignment and replacement straightforward, so you spend less time fiddling with the cartridge and more time enjoying clean, inviting water. The castle-top seal helps prevent bypass, leading to more consistent sanitizer efficiency and fewer cloudy days between cleanings.
Ideal for: spa enthusiasts and small-pool owners who want a dependable, cross-compatible replacement that fits their existing housing and avoids unnecessary downtime. It’s a practical upgrade when migrating from FC-3058 or 70354, delivering familiar performance with a straightforward install.
Helpful tips for best results:
- Rinse the cartridge under clean water after heavy use to dislodge trapped debris and maintain optimal flow.
- Inspect the O-ring and housing gasket regularly; replace damaged seals to prevent bypass.
- Replace the cartridge on a routine schedule (based on usage) to sustain water clarity and system efficiency—commonly every 6–12 months for residential spa setups, or sooner with heavy or chlorinated usage.
- Pre-wet a new cartridge before first operation to reduce initial dry-start strain on your pump and ensure even wetting of the media.
| Application |
Dimension One |
| Bottom Physical Dimension |
2" |
| Bottom Style |
Open w/Twist Lock |
| Diameter |
7-1/8" |
| Length |
5-7/8" |
| Media Type |
3oz |
| Model |
Spa Berry |
| Square Footage |
35 sq ft |
| Top Style |
Closed Castle |