• Weight: 3 oz.
• Area: 19 sq. ft.
• Width: 4 5/8"
• Length: 8"
• Part Number: FC-0121
• Top Style: Closed Crescent Handle
• Bottom Style: 2" MPT
• Compatible replacement for: Pleatco PTL18P-4, Aladdin 11901, Vita Spas PVT-25N
The Unicel 4CH-21 R Compatible Pool & Spa Replacement Filter Cartridge is a compatible replacement filter also known as the Filbur FC-0121. This pool filter cartridge has treated antimicrobial end caps that ward off bacteria. This swimming pool filter is made with a strong center core that evenly distributes stress and can withstand a lot of debris. The compatible Unicel 4CH-21 has a high quality filter media that is designed to increase efficiency along with durability. This spa filter has a wide band that keeps the filter media in place, and also it will not break under exertion. This pool filter has molded antimicrobial end fittings that are designed to be installed and removed easily.