Karofi Big Blue PP Sediment Pre-Filter Cartridge – 20" x 4.5" | 5 Micron
The Karofi Big Blue PP Sediment Filter is a high-capacity polypropylene spun pre-filter cartridge designed for whole-house water filtration systems. At the industry-standard 20" x 4.5" (Big Blue) dimensions, it delivers significantly greater flow rate and dirt-holding capacity than standard 10-inch cartridges — making it the right choice for whole-house applications, high-sediment water supplies, and any system where flow rate and filter longevity are priorities.
Rated at 5 microns, it captures sand, silt, dirt, rust flakes, and suspended solids before they reach your carbon blocks, GAC media, or RO membranes — protecting your downstream filtration investment and extending the life of every stage in your system.
Key Features
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5-Micron Filtration: Removes particles as small as 5 microns — including sand, silt, rust, dirt, sediment, and suspended solids
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20" x 4.5" Big Blue Fit: Universal drop-in replacement for all standard Big Blue 20-inch filter housings — no adapters required
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High-Capacity Design: Larger cartridge volume means greater dirt-holding capacity and longer service intervals compared to standard 10-inch cartridges
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Polypropylene (PP) Spun Gradient Density Construction: Depth filtration captures larger particles on the outer layers and finer particles toward the core — maximizing dirt-holding capacity and filter life
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Protects Downstream Filters: Acts as a pre-filter to extend the life of carbon blocks, GAC media, and RO membranes by removing sediment before it reaches them
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High Flow Rate: Big Blue housing diameter supports higher flow rates suitable for whole-house supply lines without significant pressure drop
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3–6 Month Service Life: Recommended replacement interval of 3–6 months depending on local water quality and usage volume
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Easy Cartridge Replacement: Standard Big Blue sizing ensures quick swap in any compatible 20" x 4.5" housing
Technical Specifications
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Brand: Karofi Water Filter
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Filter Type: PP (Polypropylene) Spun Sediment Cartridge
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Dimensions: 20" x 4.5" (Big Blue standard size)
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Micron Rating: 5 micron
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Housing Compatibility: Universal — fits all standard 20" x 4.5" Big Blue filter housings
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Replacement Interval: Every 3–6 months (varies by water quality and usage)
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SKU: PP20
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Barcode (UPC): 8936193082382
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Weight: 1.8 lbs
What It Removes
- Sand & grit
- Silt & sediment
- Dirt & dust particles
- Rust & scale flakes
- Suspended solids down to 5 microns
Compatible Applications
- Whole-house sediment pre-filtration systems (primary use case)
- High-flow commercial and light industrial filtration systems
- Well water whole-house pre-filtration
- Municipal water whole-house pre-filtration
- Multi-stage under-sink systems with Big Blue housings
- Karofi whole-house water filtration systems
- Any system using standard 20" x 4.5" Big Blue filter housings
Big Blue vs. Standard 10" Cartridge: Why Size Matters
The 20" x 4.5" Big Blue format provides approximately 4x the filtration volume of a standard 10" x 2.5" cartridge. This translates directly to:
- Higher flow rates without pressure drop — suitable for whole-house supply lines serving multiple fixtures simultaneously
- Greater dirt-holding capacity — longer service life between replacements in high-sediment applications
- Lower cost-per-gallon of filtered water over the cartridge's service life
Replace every 3–6 months or when flow rate noticeably decreases. Flush the new cartridge for 2–3 minutes before use. For well water or high-sediment supplies, inspect monthly.
