The LiquaGen 4.5” x 20” Birm + KDF-85 Filter Cartridge is a high-capacity Big Blue cartridge designed for whole-house water treatment.
Using a powerful dual-media blend of Birm media and KDF-85 granules, it effectively reduces iron, manganese, and hydrogen sulfide (rotten egg odor)—three of the most common well water problems.
With its large 4.5” diameter and 20” length, this refillable cartridge delivers extended capacity, higher flow rates, and longer service life compared to smaller cartridges. Ideal for households with moderate iron or sulfur levels (≤5 ppm), it ensures stain-free plumbing, odor-free water, and reliable appliance protection.
🛡️ Iron & Manganese Reduction – Prevents staining, discoloration & metallic taste.
💧 Hydrogen Sulfide Odor Control – Eliminates rotten egg smells from well water.
🌱 Dual Media Protection – Birm enhances iron/manganese removal, while KDF-85 targets sulfur, scale & bacteria.
🔧 Big Blue 20” Fit – Compatible with all standard 4.5” x 20” housings.
🚿 Whole-House Coverage – Supplies fresher, cleaner water to every tap & fixture.
♻️ Easy Maintenance – Drop-in cartridge; no backwashing or regeneration required.
🦠 Bacteriostatic Properties – KDF-85 media helps control bacteria & algae growth.
⏱️ Extended Capacity – Filters 8,000–10,000 gallons depending on water quality.
Model: LiquaGen 4.5” x 20” Birm + KDF-85 Filter Cartridge
Size: 4.5” x 20” (Big Blue Cartridge)
Media Type: Birm + KDF-85
Functions: Iron, manganese & hydrogen sulfide reduction
Capacity: ~8,000–10,000 gallons (varies by water quality)
Lifespan: 6–12 months typical residential use
Max Flow Rate: 3.0–4.0 GPM
pH Range: 6.5 – 8.5
Dissolved Oxygen Requirement: Iron (ppm) × 0.6
Max Iron Level: ≤ 5 ppm
Max Pressure: 90 PSI (6.2 bar)
Operating Temp: 40–100°F (4.4–37°C)
Housing Compatibility: Fits all standard 4.5” x 20” Big Blue housings
🚰 Whole-House Filtration – Cleaner, odor-free water for all faucets & showers.
🌾 Well Water Treatment – Targets iron, manganese & sulfur issues in rural wells.
🧊 RO Pre-Filtration – Protects RO membranes from iron & H₂S fouling.
🛁 Bathroom & Fixture Protection – Prevents staining in sinks, tubs, toilets & showers.
🧺 Appliance Longevity – Extends life of dishwashers, water heaters & washing machines.
The LiquaGen 4.5” x 20” Birm + KDF-85 Filter Cartridge is built for maximum capacity and performance, making it the ideal whole-house solution for homes with well water challenges.
With its dual-media design, Big Blue compatibility, and long-lasting capacity, it provides superior protection against iron, manganese, and hydrogen sulfide odors, ensuring fresher, cleaner, and safer water across your entire home.
✨ High-capacity Big Blue 20” design
✨ Dual-media iron + sulfur reduction
✨ Long-lasting & refillable
✨ Trusted LiquaGen performance