20" x 4.5" Scale Inhibitor GAC Filter Cartridge - Chemical Removal & Hard Water Protection

SKU: PS-20GACS-RC
$195.00
  • Advanced Scale Control + Chemical Filtration: Unique filter combines high-performance granular activated carbon with integrated scale inhibitor technology to tackle both contamination and hard water problems.
  • Prevents Scale Buildup: Siliphos scale inhibitor creates protective barrier on metal surfaces, preventing costly lime scale deposits and extending equipment life.
  • Comprehensive Chemical Removal: Reduces chlorine, chloramines, pesticides, herbicides, VOCs, and other chemical impurities for cleaner, safer water.
  • Universal Fit: Compatible with all standard 20" large diameter filter housings, including Big Blue systems.
  • Proven Technology: NSF 61-certified carbon media with established scale inhibitor chemistry for reliable performance.

Free Shipping (Excl. AK/HI)

Multi-Function Water Filter Cartridge with Scale Control – Removes Chlorine, PFAS, & Chemical Contaminants While Preventing Hard Water Scale Damage – 20" x 4.5" Big Blue Compatible

The BG-20GAC-SI combines high-performance granular activated carbon filtration with integrated Siliphos scale inhibitor technology in one innovative cartridge. This unique design addresses multiple water quality issues: removing harmful chemical contaminants while preventing hard water scale deposits and corrosion throughout your plumbing system.

Solves Hard Water Problems: The integrated scale inhibitor forms a protective microscopic layer on metal surfaces, preventing lime scale buildup that damages appliances, reduces water flow, and creates costly maintenance issues. Unlike traditional filters that only remove contaminants, this innovative cartridge actively protects your entire water system from hard water damage.

Superior Chemical Removal: Premium coconut shell activated carbon effectively reduces chlorine, chloramines, hydrogen sulfide, pesticides, herbicides, and volatile organic compounds (VOCs) for cleaner, better-tasting water throughout your home or business.

Perfect for homes and light commercial applications dealing with both chemical contamination and hard water challenges. This drop-in replacement fits all standard 20" x 4.5" filter housings, making it the ideal upgrade for existing Big Blue and compatible filtration systems.

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If you have questions about the best way to solve your water problems, please get in touch.

Fast Delivery

We ship orders quickly from our location in Arizona and most arrive within 2 - 5 business days

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Frequently Asked Questions

What contaminants does this filter reduce?

Chlorine, Chloramine, Chemicals, Pesticides, PFAS (forever chemicals), Limescale

How long does the filter last?

1 year

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Comparing Your Best Water Treatment Options

A table comparing the facets of 3 products
Facet
Title
Title20" x 4.5" Scale Inhibitor GAC Filter Cartridge - Chemical Removal & Hard Water Protection20" x 4.5" High-Capacity Granular Activated Carbon (GAC) Filter Cartridge20" x 4.5" Catalytic Carbon Water Filter For Lead & Heavy Metals (0.5 Micron)
Price
Price
$195.00
$170.00
$193.00
Type
TypeReplacement FilterReplacement FilterReplacement Filter
Filtration Process
Filtration Process

Click for more information about different filtration processes.

Adsorption
Adsorption
Adsorption
Type of Filter
Type of Filter

Click for more information about different types of filters.

GAC, Anti Scale
GAC
Catalytic Carbon
Micron Rating
Micron Rating
-
-
0.5 micron
Filter Life
Filter Life

May vary due to local water conditions, usage, and flow rate.

1 year
1 year
1 year
Flow rate
Flow rate

May vary due to water pressure and whether the filter is clogged.

20 GPM
20 GPM
7 GPM
Contaminants targeted
Contaminants targeted
Chlorine, Chloramine, Chemicals, Pesticides, PFAS (forever chemicals), Limescale
Chlorine, Chloramine, Chemicals, Pesticides, PFAS (forever chemicals)
Lead, Chlorine, Chloramine, Chemicals, Pesticides, PFAS (forever chemicals), Microplastics
Housing Material
Housing Material

The plastic or stainless steel container that encases a water filter cartridge and directs water flow through for filtration.

Stainless Steel - More durable, longer life-span, and resistant to higher pressures than plastic housings.

Plastic
Plastic
-
Water Source
Water Source
Municipal
Municipal
Municipal
Size
Size
20" x 4.5"
20" x 4.5"
20" x 4.5"

Fulfilling Your Filtration Priorities

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20" x 4.5" GAC water filter cartridge with scale inhibitor technology - white cylindrical housing with blue cap for Big Blue compatible housings, removes chlorine and prevents hard water scale buildup
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Title

20" x 4.5" Scale Inhibitor GAC Filter Cartridge - Chemical Removal & Hard Water Protection

Price

$195.00
Filtration Process

Mechanical - A physical barrier traps particles to remove them from water.

Adsorption - Traps particles and some dissolved contaminants through physical and chemical interactions.

Ultrafiltration - Removes ultrafine particles and bacteria.

Multi-stage - Multiple filter stages that target specific contaminants.

Reverse Osmosis - Removes all contaminants to produce pure water.

Alkaline - Increases alkalinity (pH) and antioxidant level.

Adsorption
Type of Filter

Activated Carbon Block - Removes chlorine, organic compounds, and other contaminants from water.

Catalytic Carbon - Removes chloramines and some heavy metals; more effective chlorine and organic compound removal than activated carbon block filters.

Anti Scale - Prevents hard water scale and corrosion.

Sediment - Removes suspended particles such as sand, dirt, rust, and sediment from water.

Pleated - Removes bacteria, viruses, ultrafine particles, and other contaminants from water.

Granular Activated Carbon - Removes chlorine and some other contaminants; less effective particulate filtration compared to carbon block filters.

GAC, Anti Scale
Micron Rating
Filter Life

May vary due to local water conditions, usage, and flow rate.

1 year
Flow rate

May vary due to water pressure and whether the filter is clogged.

20 GPM
Contaminants targeted
Chlorine, Chloramine, Chemicals, Pesticides, PFAS (forever chemicals), Limescale
Housing Material

The plastic or stainless steel container that encases a water filter cartridge and directs water flow through for filtration.

Stainless Steel - More durable, longer life-span, and resistant to higher pressures than plastic housings.

Plastic
Water Source
Municipal
Size
20" x 4.5"
View details