If you’re shopping for a 20 inch Big Blue water filter, you want reliable filtration that protects appliances, improves taste, and fits standard housings. This guide highlights five strong choices designed for whole-house sediment and carbon filtration. Each option targets common needs: sediment removal, chlorine taste and odor reduction, or combined filtration. The list helps readers decide who benefits most from each cartridge or housing combination, from well water users to city water households.
Summary of chosen products
| Product | Type | Best For | Notes |
|---|---|---|---|
| Pentair Pentek DGD-5005-20 | Sediment Cartridge (5 Micron) | Homes needing high dirt-holding capacity | Dual-Gradient Density, NSF/ANSI 42 |
| Pentair Pentek DGD-5005-20 | Sediment Cartridge (5 Micron) | Same as above, single-pack option | Pack of 1 available |
| Aquaboon 4.5 x 20 Carbon Filter | Carbon Block (5 Micron) | Taste/odor reduction, chlorine control | Carbon CTO, broad compatibility |
| Aquaboon 5 Micron 20 x 4.5 | Sediment Cartridge (5 Micron) | Sediment-heavy water, steady flow | High flow rates, low pressure drop |
| Pentair Pentek NCP-20BB | Carbon Block (10 Micron) | Combined sediment/chlorine reduction | Pleated, high dirt loading |
Pentair Pentek DGD-5005-20 Big Blue Sediment Filter
Type: Sediment filter cartridge, 5 micron. Material: 100% polypropylene. Filter depth and density: dual-gradient design increases dirt-holding capacity up to 3X compared with similar cartridges, delivering deeper filtration. Certification: NSF/ANSI 42 compliant for material requirements. Best for households needing robust sediment removal to protect appliances and downstream filters.
Who it’s best for: Homes with high sediment loads or wells where dirt, silt, and rust frequently enter the water. Why selected: It combines high dirt-holding capacity with a 20″ x 4.5″ footprint and broad chemical compatibility. Caution: As a sediment-only cartridge, it does not address taste or chlorine removal.
Pentair Pentek DGD-5005-20 Big Blue Sediment Filter (Pack of 1)
Type: Sediment filter cartridge, 5 micron. Material: 100% polypropylene. Features: Dual-gradient density design for enhanced dirt-holding capacity and deep filtration. NSF/ANSI 42 certified for material requirements. Best for: Similar use as the 2-pack option, offering flexibility for replacement scheduling.
Who it’s best for: Homes needing a reliable single-pack option with strong sediment capture. Why selected: Offers the same performance profile as the pack, useful for replacing a single cartridge at a time. Caution: Availability may vary by seller; verify cartridge fit in your Big Blue housing.
Aquaboon Carbon Block 4.5 x 20 Inch Filter (2 Pack)
Type: Activated carbon block, 5 micron. Function: Reduces chlorine taste and odor, captures industrial chemicals, and improves overall water taste. Fit: Standard 20″ x 4.5″ whole-house housings. Best for: Households seeking improved taste and odor with proven carbon filtration. Caution: Carbon filters should be replaced on a schedule based on water quality; may not remove dissolved minerals.
Aquaboon 5 Micron 20 x 4.5 Sediment Filter (2-Pack)
Type: Sediment cartridge, 5 micron. Features: Captures sand, rust, silt, and sediment to protect plumbing and appliances. High flow with low pressure drop due to dual-gradient design. Best for: Homes with moderate sediment loads and systems that require consistent water pressure. Caution: Designed primarily for sediment removal; does not address taste or odor.
Pentair Pentek NCP-20BB Carbon Water Filter
Type: Carbon block filter, 10 micron. Function: Reduces sediment and chlorine taste and odor in a single cartridge. Media: Non-cellulose carbon-impregnated. Fit: Works on well or city water. Best for: Households seeking mixed filtration (sediment plus chlorine reduction) in one cartridge. Caution: 10 micron rating means finer filtration than many 5 micron sediments, but may require more frequent replacements in high-sediment water.
Pentair Pentek EPM-20BB Big Blue Carbon Filter
Type: Carbon block filter with bonded powdered activated carbon. Filtration: Chlorine, taste, odor reduction along with sediment filtration. Fit: 20″ x 4.5″ cartridges in Big Blue housings. Best for: Homes needing economical chlorine and taste/odor reduction with filtration versatility. Caution: High porosity design helps with flow but may be less effective on very high sediment loads compared to dedicated sediment cartridges.
Buying Guide: Key Considerations for 20-Inch Big Blue Filters
Filtration goals
- Sediment-focused: Choose 5 micron or finer sediment cartridges to remove dirt, silt, and rust. Look for dual-gradient density designs for higher dirt-holding capacity.
- Carbon-focused: For taste and odor reduction, select carbon block cartridges (5 or 10 micron) or CTO-style filters with activated carbon.
- Combo filtration: Some cartridges combine sediment and carbon properties, offering simpler setups with fewer cartridges.
Flow and compatibility
- Ensure the cartridge length, micron rating, and housing size match your Big Blue housing (20″ x 4.5″).
- Check flow rate expectations; higher dirt loads may reduce flow if the cartridge is undersized for your service gallons per minute.
Materials and certification
- Look for NSF/ANSI 42 certification for material safety and performance claims with sediment/chemical filtration.
- Polypropylene housings and non-cellulose carbon media tend to be widely compatible with municipal and well water supplies.
Maintenance and replacement
- Keep a replacement schedule based on water quality and usage to prevent pressure drops and ensure filtration efficacy.
- Pack options allow staggered replacements or single-pack purchases depending on household size and maintenance preferences.
Installation considerations
- Most 20″ x 4.5″ Big Blue cartridges fit standard housings; verify your model supports the chosen cartridge type (sediment, carbon, or hybrid).
- Well water may require more frequent changes due to higher sediment loads; city water may benefit more from chlorine/taste/odor cartridges.
Frequently Asked Questions
What does a 5-micron sediment filter remove?
It captures particles like dirt, sand, silt, and rust to protect appliances and downstream filters.
Can I use a carbon filter to replace sediment duties?
Carbon filters primarily reduce chlorine taste and odor; they do not remove sediment as effectively as sediment cartridges.
Is a 10-micron carbon filter better for well water?
It can balance sediment reduction and taste/odor control, but very fine sediment may require a separate sediment cartridge.
How often should I replace 20″ Big Blue cartridges?
Replace based on water quality, usage, and manufacturer guidelines; well water with high sediment may require more frequent changes.
Do these filters require special tools?
Typically no special tools beyond standard housing wrenches; always follow housing and cartridge installation instructions.
Are these filters NSF certified?
Many option cartridges are NSF/ANSI 42 certified for material requirements; verify certification on the product page or container.