Unicel C-5601 Replacement Filter Cartridge: Premium Performance at Aftermarket Value

The Smart Filter Swap

OEM cartridges cost $40–$80. Quality aftermarket (Unicel, Pleatco, Filbur) deliver equal or better filtration for $20–$40. The Unicel C-5601 is a flagship example—engineered to OEM specs with upgrades that extend life and capture finer particles.

Cross-Reference Compatibility

Direct Replaces:

• Unicel C-5601
• Pleatco PJW23
• Filbur FC-1330
• OEM: Jacuzzi Whirlpool, Jacuzzi Brothers, Aquatic Industries, Echo Series, Competition Pool Products, Gatsby Spas, Apollo Spas, Safari Spas, Cantar, Blue Ridge, Seven Seas Spas, Atlantic Pool Products (Canada)

Fits Spas/Brands: 100+ models across above manufacturers. Verify via Unicel cross-reference tool.

Technical Specifications

Spec	Value
Top Load (Filtration Area)	25 sq ft (2.32 m²)
Dimensions	5-5/8" OD × 8" Length (143mm × 203mm)
Media	Spun-bonded 100% polyester (Reemay®)
Pleat Count	Precision-folded, sharp pleats (anti-flutter)
Core	Premium PVC, free-flow design
End Caps	Injection-molded polyurethane, sealed
Antimicrobial	Built-in (Microban® or equivalent)
Max Temp	104°F (40°C) continuous
Flow Rate	Up to 50 GPM (system dependent)

Why Unicel Outperforms Cheap Clones

• Media Weight: 4.0–4.5 oz/yd² vs. 2.5–3.0 (budget) — more fiber = higher dirt capacity.
• Pleat Geometry: Uniform spacing, sharp peaks — prevents pleat collapse (flutter) under flow pulsing.
• Core Strength: Crush-resistant — no implosion at high differential pressure.
• Seal Integrity: Molded end caps bond to media — no bypass leakage.
• Antimicrobial: Inhibits biofilm on media — less frequent cleaning, cleaner water.

Maintenance Protocol for Max Life

1. Rinse weekly with garden hose (45° angle, pleat-to-pleat).
2. Monthly: Soak 12–24 hrs in alkaline cartridge cleaner (TSP-free).
3. Rinse thoroughly; air dry before reinstall.
4. Rotate 2 cartridges — extends each to 18–24 months.
5. Replace when: pleats fray, end caps crack, pressure >10 psi clean, or 24 months.

Pricing & Availability

• Single: $22–$35
• 2-Pack: $40–$60
• 4-Pack: $75–$110
• Sources: InTheSwim, PoolSupplyWorld, Doheny's, Amazon (Unicel storefront), UnicelDirect.com

Bottom Line

The C-5601 isn't a compromise—it's an upgrade. Better media, better construction, antimicrobial, half the OEM price. Your spa deserves clean water; your wallet deserves this deal.