Puregen (EC-4520-W) 20"x4.5" Empty Refillable Cartridge
Puregen EC-4520-W 20"x4.5" Empty Refillable Cartridge
The Puregen EC-4520-W gives you complete control over your filtration media. This 20" x 4.5" refillable housing opens from both ends for easy loading and includes an internal sediment filter core that prevents media channeling while reducing pressure drop across your custom filter bed.
Built for Custom Media Applications
Dual-Opening Access
Both end caps unscrew for fast media loading, cleaning, and refilling without the hassle of single-ended housings
Internal Sediment Core
Built-in filter prevents media migration and fine particulate bypass while maintaining even flow distribution
Standard Big Blue Size
20 inch by 4.5 inch dimensions fit all standard big blue housings rated for jumbo cartridge applications
Low Pressure Drop
Open design with internal support structure reduces flow resistance compared to traditional packed media filters
Reusable Housing
Durable polypropylene construction allows unlimited refills with GAC, KDF, calcite, resin, or other specialty media
Custom Filtration
Load with chlorine removal carbon, iron reduction media, pH adjustment calcite, or blended media for specific water issues
Fits Standard 20x4.5 Big Blue Systems
The Puregen EC-4520-W works in any standard 20 inch big blue filter housing with 4.5 inch diameter capacity. Compatible with whole house systems, commercial pre-filtration setups, well water treatment, and point-of-entry applications requiring custom media blends. Ideal for replacing spent carbon filters, building iron/manganese reduction stages, pH correction with calcite or Corosex, or specialized chemical removal with KDF or catalytic carbon.
Puregen refillable cartridges are built for professionals and DIY water treatment specialists who need control over their filtration media.
