When pool water starts turning cloudy, pressure rises faster than normal, or filtration performance drops, worn filter cartridges are often the root cause. The Unicel CL340 C-7459-4 Filter Cartridge Set is a premium 4-pack replacement designed to fully restore the filtration performance of Jandy CL340 cartridge filter systems. Built to exact OEM specifications, this complete cartridge set delivers reliable flow, superior debris capture, and long service life.

Cartridge filters rely on surface area and fabric quality to remove fine particles efficiently. Over time, pleats flatten, fabric fibers clog permanently, and cleaning becomes less effective. Replacing all four cartridges at once ensures balanced filtration across the entire filter tank, preventing bypass, uneven wear, and unnecessary strain on the pump.

At Benchmark Pool Supply, full cartridge set replacement is strongly recommended for CL340 systems instead of mixing old and new elements. The Unicel C-7459-4 set restores the system to its original filtration capacity and performance.

Why Full Cartridge Replacement Matters

In multi-cartridge filter systems, water is distributed evenly across all elements. When only one or two cartridges are replaced, flow becomes uneven, leading to higher pressure, reduced clarity, and shortened cartridge life. A complete replacement set like the Unicel CL340 C-7459-4 ensures consistent flow distribution and maximum dirt-holding capacity.

Replacing the full set also improves circulation efficiency, which helps chemical performance, reduces pump run time, and improves overall water quality.

OEM-Fit Performance You Can Trust

Unicel cartridges are manufactured to meet or exceed original equipment specifications. The C-7459-4 cartridges feature precision-molded end caps, uniform pleat spacing, and high-quality filtration fabric designed for long-term performance.

Aftermarket cartridges that vary in height, diameter, or pleat count can compromise sealing and reduce effective filtration area. Using a Unicel OEM-fit replacement helps ensure proper seating, leak-free operation, and dependable performance season after season.

Designed for Jandy CL340 Filter Systems

This 4-pack cartridge set is engineered specifically for cartridge filter systems requiring four equal cartridges totaling approximately 340 square feet of filtration area. Each cartridge works together to deliver efficient debris removal while maintaining proper system flow rates.

Proper cartridge sizing is critical. Incorrect dimensions can cause bypass, poor filtration, or damage to the filter tank and manifold.

When to Replace Unicel CL340 Filter Cartridges

Cartridge replacement is typically recommended every 2–3 years depending on pool usage, water conditions, and maintenance habits. Signs that replacement is needed include persistent cloudy water, pressure that rises quickly after cleaning, visible fabric damage, or cartridges that no longer respond to cleaning.

Replacing cartridges before complete failure helps protect pumps, heaters, and other equipment from excessive strain.

Installation and Maintenance Considerations

Installing the Unicel C-7459-4 cartridge set is straightforward. After shutting down the system and relieving pressure, the old cartridges are removed and replaced with the new set. Proper alignment and seating ensure correct water flow and sealing.

Routine rinsing and periodic deep cleaning will extend cartridge life and maintain peak filtration efficiency.

Product Specifications

Buy with Confidence from Benchmark Pool Supply

When you purchase the Unicel CL340 C-7459-4 Filter Cartridge Set from Benchmark Pool Supply, you’re buying a trusted filtration solution from a pool supply company that understands system compatibility and real-world performance. We stock premium replacement cartridges, verify fitment, and stand behind what we sell. Whether you’re maintaining your own pool or servicing customers, you can trust you’re getting the right cartridges backed by experience.