GAC + KDF 55 + KDF 85 Refill Media Kit – Fits 4.5" x 20" Whole House Well Water Filters – Reduces Iron, Sulfur & Chlorine reefing Tank Size Calcite Media Required

Tank Size Calcite Media Required 9" × 48" 75 lbs 10" × 54" 100 lbs 12" × 52" 125 lbs 13" × 54" 150 lbs

and phosphates

⏱️ Extended Lifespan – Larger format means fewer filter changes and longer service life

Add our KDF MediaGuard at the time of purchase

GAC + KDF 55 + KDF 85 Refill Media Kit – Fits 4.5" x 20" Whole House Well Water Filters – Reduces Iron, Sulfur & Chlorine reefing Tank Size Calcite Media RequiredRefill Media Kit for Big Blue 4. 5" x 20" Well Water Filter KDF 85, KDF 55 & Activated Carbon for Iron, Sulfur, Chlorine, and Heavy Metal Reduction Compatible with 20" Big Blue Housings by Oceanic Water Systems Product Description Overview Upgrade your Big Blue 4. 5" x 20" refillable well water filter with our premium GAC + KDF 55 + KDF 85 media refill kit, engineered to effectively reduce iron, sulfur, chlorine, and heavy metals. Perfect for