Description
The 20″ Hydro-Cure Big Blue Dual Gradient 25/05 Micron Sediment Filter is a high-performance cartridge engineered to efficiently remove both coarse and fine particulate matter from your water supply. Featuring dual gradient (graded) polypropylene media, this filter captures larger sediment with the outer 25 micron layer and finer particles with the inner 5 micron core—delivering prolonged life, superior flow, and dependable protection for downstream water treatment equipment.
Designed for large-capacity whole-home and light commercial systems, this filter helps maintain water clarity and system performance where sediment levels vary.
Key Features
- Dual Gradient Filtration (25 → 5 Micron)
- Outer 25 micron layer captures larger debris
- Inner 5 micron layer traps fine sediment
- Big Blue High-Flow Design
- Large 4.5″ × 20″ format supports high water demand with reduced pressure drop
- High Dirt-Holding Capacity
- Dual-density media extends service life compared to single-density filters
- Robust Polypropylene Construction
- Safe for potable water and chemically inert
- Protects Downstream Equipment
- Shields softeners, carbon filters, UV systems, and RO membranes from clogging
Compatibility
The 20″ Hydro-Cure Big Blue Dual Gradient 25/05 Micron Sediment Filter is compatible with:
- 20″ Big Blue filter housings (4.5″ × 20″)
- Whole-home point-of-entry systems
- Pre-treatment ahead of:
- UV disinfection systems
- Water softeners
- Carbon filters
- Reverse osmosis systems
⚠️ Not suitable for slim-line (2.5″ diameter) housings.
Specifications
Filter Type – Dual Gradient Sediment Filter
Size – 4.5″ × 20″ (Big Blue)
Micron Rating – 25 μm outer → 5 μm inner
Media Material – Dual-density polypropylene
Application – Whole-home sediment filtration
Replacement Interval – Usually 3–6 months (depends on water quality)
Applications
This dual gradient filter is ideal for:
- Whole-home water filtration systems
- Well water sediment pre-treatment
- Pre-carbon filtration
- Pre-softener protection
- Pre-UV disinfection filtration
- Cottage or rural properties
- Light commercial water systems
By capturing a broad range of particle sizes, this filter helps optimize performance in varied water quality conditions.
Maintenance & Care
To maintain efficient filtration:
- Inspect Regularly: Check filter condition every 1–3 months
- Replace as Needed: Replace the cartridge when flow slows noticeably or visible sediment accumulates
- Depressurize Housing: Always turn off water and release pressure before servicing
- Use Pre-Filters Appropriately: In extremely high sediment situations, consider staging a coarser pre-filter ahead
Routine maintenance ensures long service life and consistent water quality for your entire treatment system.
Benefits of Dual Gradient Filtration
✔ Extended life compared to single-density cartridges
✔ Better performance in variable sediment conditions
✔ Strong flow with minimal pressure drop
✔ Improved protection for downstream systems
✔ Fewer filter changes required
The 20″ Hydro-Cure Big Blue Dual Gradient 25/05 Micron Sediment Filter is a reliable, high-capacity solution for homeowners and professionals seeking staged sediment removal and long service life in whole-home water filtration systems.

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