🌊 Product Overview
The LiquaGen 4.5” x 20” Birm / KDF85 Filter Cartridge is a high-capacity Big Blue cartridge designed for whole-house water treatment. Using a proven blend of Birm media and KDF85 granules, it effectively reduces iron, manganese, and hydrogen sulfide (rotten egg smell)—three of the most common well water problems.
With its large 4.5” diameter and 20” length, this refillable cartridge offers extended capacity, higher flow rates, and longer service life compared to smaller filters. Ideal for homes with moderate iron or sulfur levels (<5 ppm), it ensures stain-free plumbing, odor-free water, and improved appliance protection.
✨ Key Benefits & Features
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🛡️ Iron & Manganese Reduction – Prevents staining, discoloration, and metallic taste in household water.
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💧 Hydrogen Sulfide Odor Control – Removes rotten egg smells caused by H₂S contamination.
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🌱 Dual Media Filtration – Birm improves iron/manganese removal, while KDF85 targets sulfur, scale, and bacteria.
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🔧 Big Blue 20” Compatibility – Fits all standard 4.5” x 20” whole-house filter housings.
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🚿 Whole-House Protection – Supplies cleaner, fresher water to every faucet, fixture, and appliance.
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♻️ Easy Maintenance – Drop-in cartridge requires no backwashing or regeneration.
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🦠 Bacteriostatic Properties – KDF85 media helps inhibit bacterial and algae growth.
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⏱️ Extended Capacity – Treats up to 8,000–10,000 gallons depending on water quality.
📋 Technical Specifications
| Parameter | Details |
|---|---|
| Model | LiquaGen 4.5” x 20” Birm / KDF85 Filter Cartridge |
| Size | 4.5” x 20” (Big Blue Cartridge) |
| Media Type | Birm + KDF85 |
| Primary Functions | Reduces iron, manganese, and hydrogen sulfide |
| Capacity | ~8,000–10,000 gallons (varies by water quality) |
| Recommended Lifespan | 6–12 months (residential use) |
| Max Flow Rate | 3.0–4.0 GPM |
| Max Pressure | 90 PSI (6.2 bar) |
| Operating Temp. | 40–100°F (4.4–37°C) |
| Required pH Range | 6.5 – 8.5 |
| Recommended DO Level | Iron level (ppm) × 0.6 |
| Max Iron Level | ≤ 5 ppm |
| Housing Compatibility | Fits all standard 4.5" x 20” Big Blue housings |
🏠 Applications
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🚰 Whole-House Filtration – Delivers cleaner, odor-free water to every faucet and shower.
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🌾 Well Water Treatment – Effective against iron, manganese, and H₂S found in private wells.
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🧊 Pre-Filtration for RO Systems – Reduces iron and sulfur before water reaches RO membranes.
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🛁 Fixture & Bathroom Protection – Prevents staining in tubs, sinks, showers, and toilets.
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🧺 Appliance Longevity – Protects dishwashers, washing machines, and water heaters from iron and sulfur damage.
💙 Why Choose LiquaGen?
The LiquaGen 4.5” x 20” Birm / KDF85 Filter Cartridge is built for maximum performance and capacity, making it the ideal choice for whole-house water treatment. With its dual-media design, Big Blue compatibility, and ability to handle higher flow rates, it provides long-lasting protection against iron, manganese, and hydrogen sulfide odors.