Empty Refillable Cartridge 20" x 4.5" White MatriKX (01-425-125-975) 10"X4.5" Big Blue +1 Carbon Block VOC Reduction 0.6 Micron Filter Verify your existing filter's thread

Verify your existing filter's thread size before ordering

Neutralization Process

Dual-action electrode composition targets both ferrous iron and dissolved aluminum for comprehensive heavy metal oxidation and precipitation

If water delivery becomes sluggish or the tank feels heavy when empty

Empty Refillable Cartridge 20" x 4.5" White MatriKX (01-425-125-975) 10"X4.5" Big Blue +1 Carbon Block VOC Reduction 0.6 Micron Filter Verify your existing filter's threadWatts RC C BB 20 50 Empty Refillable Cartridge 20" x 4. 5" White Reusable canister for custom media applications in Big Blue housing systems Refillable 50 Micron Foam Pad 155 Cubic Inches WHY IT WORKS Fill It With What You Need Reusable Design Refill and reuse instead of replacing. The Watts RC C BB 20 50 accepts any granular or specialty media you need for custom filtration applications. Big Blue Standard Fits all standard 20" x 4. 5" Big Blue