Unicel C-6900-4 Quad DE Filter Cartridge Set 25 Sq Ft
The C-6900-4 Quad D.E. Replacement Cartridge Set is a complete 4-pack of 25 square foot cartridges (100 sq. ft. total) designed to restore proper filtration performance in Pentair Quad D.E. 100 and Hayward DE250E pool filter systems. These cartridges act as the structural filtration elements that are coated with D.E. powder or D.E. alternatives to deliver exceptionally fine filtration.
Unlike standard cartridge filters, Quad D.E. systems rely on these rigid internal elements to maintain hydraulic balance while filtering down to 3–5 microns. When cartridges become worn, torn, or “blinded” by oils and debris, filtration efficiency drops, pressure rises, and debris may bypass the system entirely. Replacing all four cartridges ensures uniform flow, correct pressure, and restored water clarity.
Manufactured to meet exact fit and performance standards, the C-6900-4 set is engineered for durability, proper spacing, and long-term reliability in Quad D.E. filter systems.
Why Quad D.E. Cartridges Matter
These cartridges form the foundation of Quad D.E. filtration.
Why this matters:
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Provides ultra-fine filtration down to 3–5 microns
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Maintains proper internal pressure balance
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Prevents debris bypass inside the filter tank
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Supports even D.E. coating across all elements
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Restores full system filtration efficiency
Replacing partial sets can cause uneven flow and reduced performance—full replacement is recommended.
Designed for Quad D.E. & Hayward D.E. Systems
The C-6900-4 cartridge set is designed specifically for:
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Pentair Quad D.E. 100
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Hayward DE250E
Correct sizing and rigidity are critical for proper sealing and internal support. Always confirm filter model compatibility before installation.
Durable Filtration Media & Structural Design
Each cartridge is constructed using high-density polyester filtration media bonded to a rigid internal core. This design allows the cartridges to withstand D.E. loading, backwashing cycles, and operating pressure without collapsing or deforming.
The pleated surface maximizes usable filtration area while maintaining consistent water flow throughout the filter.
Installation & Service Notes
For best results:
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Turn off the pool pump and fully relieve filter pressure
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Open the filter tank and remove the manifold assembly
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Remove all four old cartridges
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Inspect manifold, standpipe O-rings, and internal seals
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Install all four new cartridges evenly
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Reassemble the filter and recharge with D.E. per manufacturer specifications
Cartridge replacement is typically recommended every 2–3 seasons, depending on water conditions and maintenance.
Product Specifications
| Specification | Details |
|---|---|
| Model | C-6900-4 |
| Product Type | Quad D.E. replacement cartridges |
| Quantity | 4 cartridges |
| Surface Area | 25 sq. ft. each (100 sq. ft. total) |
| Application | Quad D.E. filtration systems |
| Compatible Filters | Pentair Quad D.E. 100, Hayward DE250E |
| Filtration Level | 3–5 microns (with D.E.) |
| Condition | New replacement set |
Buy with Confidence from Benchmark Pool Supply
When you purchase the C-6900-4 Quad D.E. Replacement Cartridge Set from Benchmark Pool Supply, you’re getting a professional-grade filtration solution trusted by pool service technicians. We stock complete replacement sets to ensure proper system balance, long service life, and crystal-clear water.
Benchmark Pool Supply is your reliable source for Quad D.E. and D.E. filter replacement components.
