The Harmsco HB-20-20W delivers reliable 20 micron sediment filtration in a durable pleated polyester design built for both whole-house and reverse osmosis applications. This 20"x4.5" Big Blue cartridge fits standard Harmsco housings and offers exceptional dirt holding capacity with the extended surface area of pleated media.
SPECIFICATIONS
Harmsco HB-20-20W Technical Details
| Model Number | HB-20-20W |
| Dimensions | 20" x 4.5" (Big Blue Standard) |
| Micron Rating | 20 Micron |
| Media Type | Pleated Polyester |
| Color | Calypso Blue |
| Filter Type | Sediment (Pleated) |
| Application | Whole House, RO Pre-filtration |
| Housing Compatibility | 20" Big Blue Housings |
INSTALLATION & USE
Replacing Your Harmsco Sediment Filter
- Shut off water supply and relieve system pressure using the housing's pressure release button or valve
- Unscrew the Big Blue sump housing using a filter wrench, remove the old HB-20-20W cartridge, and clean the sump with mild soap and water
- Inspect and lubricate the o-ring, insert the new Harmsco HB-20-20W filter into the housing, and hand-tighten the sump until seated
- Turn water supply back on slowly, check for leaks around the housing seal, and run water for 2-3 minutes to flush the new filter
COMPATIBILITY
Works With Standard 20" Big Blue Systems
The Harmsco HB-20-20W fits all standard 20 inch Big Blue filter housings with 4.5" inner diameter, including Harmsco brand housings and most third-party equivalents. The 20 micron rating makes this filter ideal for sediment pre-filtration in whole-house systems, well water applications, and upstream protection for reverse osmosis membranes and carbon block filters. Replace every 6-12 months depending on sediment load and water quality.
🔧 Pro Tip: Mark the installation date on the filter housing with a grease pencil or label. Pleated filters often maintain flow rate even when loaded with sediment, so a date reminder prevents you from running a saturated filter past its effective lifespan.
