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Purcooflow 20" x 4.5" 5 Micron String Wound Sediment Filter – Big Blue Heavy-Duty Replacement Cartridge
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Food-Grade Durable String Wound Construction: Made from high-strength polypropylene fiber with no adhesives or chemical binders. BPA-free and resistant to chemicals, ensuring safe and stable whole-house water filtration.
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Advanced Deep Layer Filtration Structure: Built with precision gradient winding technology that captures particles throughout the filter depth. Enhances dirt-holding capacity and reduces clogging for longer service life.
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5-Micron Sediment Removal Efficiency: Effectively removes sand, rust, dirt, silt, and other suspended particles. Provides clean and clear water for everyday household use and protects downstream filtration components.
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Universal Fit for 20" x 4.5" Big Blue Systems: Compatible with all standard 20-inch Big Blue housings and most whole-house filtration systems. Easy drop-in replacement with no modification required.
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High Capacity for Whole-House Protection: Designed for high-demand water systems, providing stable filtration performance for large households, villas, and multi-point water usage environments.
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Extends Lifespan of Entire Water System: Protects downstream carbon filters, RO systems, water heaters, and appliances from sediment buildup, reducing maintenance costs and improving system longevity.
- Free Shipping On all orders
- 30-Day Return No worries
- 2 Year Warranty Hassle-free
Tech Specs - 20-inch Sting Wound Filter
100% Food Grade Polypropylene
5 Micron
Standard 20" x 4.5"
Standard 10-inch BB Housings
104°F (40°C)
90 psi
15 GPM
3 - 6 Months
NSF 42 / FDA Compliance
3D Strings Structure
Compatible with Most 20" × 4.5" Big Blue Housings
Designed to fit most standard 20" × 4.5" Big Blue filter housings used in whole-house water filtration systems. Easy replacement, dependable performance, and broad compatibility.
FAQs
Learn how Purcooflow string wound technology provides deep sediment filtration, protects plumbing systems, and ensures reliable performance for compact whole-house water filtration systems.
Contact SupportThe Purcooflow string wound filter is designed to capture sand, rust, dirt, silt, and other suspended particles from water. Its tightly wound polypropylene yarn structure provides effective depth filtration for improved water clarity.
String wound filters use a layered winding structure that traps larger particles on the outer layers while capturing finer sediment deeper inside. This improves dirt-holding capacity and extends filter lifespan.
Unlike surface-only filters, string wound cartridges provide true depth filtration. This means contaminants are captured throughout the entire filter media, not just on the surface, reducing clogging and maintaining more stable flow.
No. Designed for compact 20" × 4.5" Big Blue housings, the string wound structure maintains stable household water flow while effectively removing sediment and particles under normal residential conditions.
Replacement is typically recommended every 3–6 months depending on water quality and sediment levels. High sediment water sources such as well water may require more frequent replacement.
Yes. This filter is manufactured to standard 20" × 4.5" Big Blue dimensions and is compatible with most compact whole-house filtration systems that use standard BB housings.