This is a single replacement cartridge filter, manufactured by Unicel, designed to be compatible with the Jandy CL340 pool filter. Here's a breakdown:

• Unicel Brand: Unicel is known for producing high-quality aftermarket pool and spa filter cartridges, offering alternatives to OEM (original equipment manufacturer) filters.  
• Jandy CL340 Compatibility: This cartridge is specifically designed to fit the Jandy CL340 cartridge filter housing.
• 85 sq ft (Square Feet): This indicates the filter's surface area. A larger surface area generally means the filter can trap more debris and requires less frequent cleaning.  
• C-7459 Model Number: This is the Unicel model number, used for identifying the specific cartridge and ensuring compatibility.
• Cartridge Filter: This type of filter uses pleated filter media to trap debris as water passes through.  
• Replacement Cartridge: This is a replacement for a worn or damaged cartridge in a Jandy CL340 filter.  
• Purpose: To filter pool water, removing dirt, debris, and other impurities, resulting in cleaner and clearer water.  
• Benefits:
  • Provides efficient filtration.  
  • Offers a cost-effective alternative to Jandy OEM filters.  
  • Easy to install and clean.

In summary: The Unicel Replacement Filter Cartridge C-7459 is a single, 85 sq ft filter cartridge designed to fit the Jandy CL340 filter. It provides a reliable and cost-effective way to maintain clean and clear pool water.