Hard Water Protection
SHIELD
SCALE CONTROL
Protect your pipes, fixtures, and appliances from hard water damage - without adding salt or removing beneficial minerals. SCALE CONTROL prevents scale buildup using proven technologies. You can choose comprehensive protection with Active Armour® or ScaleStop®.
NSF/ANSI 60
ca prop 65
IAPMO
Prevents calcium & magnesium from bonding to pipes, fixtures, and appliances
High-flow filter capable of up to 15 Gallons per Minute (GPM)
Salt-free, no sodium solution
Download
spec sheet
NSF 60
Safety Certified
15 GPM
Peak flow rate
200,000+
Gallon capacity
HARD WATER PROTECTION
SHIELD
SCALE CONTROL
Protect your pipes, fixtures, and appliances from hard water damage - without adding salt or removing beneficial minerals. SCALE CONTROL prevents scale buildup using proven technologies. You can choose comprehensive protection with Active Armour® or ScaleStop®.
NSF/ANSI 60
CA PROP 65
IAPMO
Prevents calcium & magnesium from bonding to pipes, fixtures, and appliances
High-flow filter capable of up to 15 Gallons per Minute (GPM)
Salt-free, no sodium solution
Download
Spec sheet
NSF 60
SAFETY CERTIFIED
15 GPM
Peak flow rate
200,000+
Gallon capacity
hard water protection
SHIELD
SCALE CONTROL
Protect your pipes, fixtures, and appliances from hard water damage - without adding salt or removing beneficial minerals. SCALE CONTROL prevents scale buildup using proven technologies. You can choose comprehensive protection with Active Armour® or ScaleStop®.
NSF/ANSI 60
ca prop 65
IAPMO
Prevents calcium & magnesium from bonding to pipes, fixtures, and appliances
High-flow filter capable of up to 15 Gallons per Minute (GPM)
Salt-free, no sodium solution
Download
Spec sheet
NSF 60
sAFETY cERTIFIED
15 GPM
Peak flow rate
200,000+
Gallon capacity
TWO variants — one platform
Matched to your water profile.
Matched to your water profile.
Your dealer selects the right variant based on your utility's disinfection method and water chemistry.
Your dealer selects the right variant based on your utility's disinfection method and water chemistry.
SLD-AA-300
Active Armour 300
Active Armour 300
Active Armour prevents hardness compounds from sticking to themselves or anything else to form scale. The safe chemistry of Active Armour bonds to exposed metal components to protect from corrosion.
Active Armour prevents hardness compounds from sticking to themselves or anything else to form scale. The safe chemistry of Active Armour bonds to exposed metal components to protect from corrosion.
SLD-SCALESTOP
GUARDIAN 20A • SLD-GRD-20A
ScaleStop
ScaleStop
Chloramine
Carbon Block
Salt-free, scale-management cartridge that converts hardness minerals into inactive microscopic crystals to reduce hard-scale adhesion on fixtures and heat exchangers.
Salt-free, scale-management cartridge that converts hardness minerals into inactive microscopic crystals to reduce hard-scale adhesion on fixtures and heat exchangers.
Active Armour technology
How Active Armour works.
A phosphate-based approach with no salt, no regeneration, and no sodium discharge.
1
Phosphate Dosing
I Phosphate Dosing
SHIELD SCALE CONTROL introduces a precisely metered amount of food-grade phosphate into your water supply. NSF 60 certifies the phosphate formulation is safe for drinking water at the point of application - no harmful byproducts introduced.
Scale Crystal Interruption
2 Scale Crystal Interruption
Calcium carbonate scale forms when minerals crystallize and bond to pipe walls and heating surfaces. Phosphate interferes with the crystallization process - calcium and magnesium stay in solution rather than depositing as scale. This is not softening: minerals remain, they just cannot bond.
2
3
Protective Nano-Layer
3 Protective Nano-Layer
Phosphate forms a thin protective layer on pipe interiors and metallic fixture surfaces. This layer inhibits oxidative corrosion throughout the plumbing system - protecting copper and steel pipe, faucet internals, water heater elements, and appliance surfaces from corrosion-related degradation.
4
No Salt, no Waste, no Maintenance Chemicals
4 No Salt, no Waste, no Maintenance Chemicals
Unlike traditional water softeners, SHIELD SCALE CONTROL does not require salt bags, brine tanks, or regeneration cycles. There is no sodium discharge into your drain - an important environmental distinction, and a legal requirement in some jurisdictions where salt-based softeners are regulated or banned.
Complete System Pairings
Complete System Pairings
SCALE CONTROL works with any SHIELD filter - or on its own
Recommended
PALADIN + SCALE CONTROL
Maximum health protection
Recommended flagship pairing
Scale prevention
Best-in-Tech pairing
GUARDIAN + SCALE CONTROL
Disinfectant removal
For municipal water without lead/PFAS concerns
Scale prevention
Maintains high-flow rate
SCALE CONTROL
Protects appliances
Infrastructure protection for any home
Extends plumbing life
Standalone solution
Technical specifications
Built for whole-home protection.
Built for whole-home protection.
Model SLD-AA-300 and SLD-SCALESTOP on SHIELD Core housing platform.
Model SLD-AA-300 and SLD-SCALESTOP on SHIELD Core housing platform.
Specification
SHIELD Active Armour
(SLD-AA-300)
SHIELD SCALESTOP
(SLD-SCALESTOP)
Technology
Active Armour
ScaleStop
Peak Flow Rate
20 Gallons Per Minute (GPM)
Service Flow Rate
12 GPM
12 GPM
Media Lifespan
>100,000 gallons @ 8 GPM
>100,000 gallons @ 8 GPM
Filter Media
Highly-Activated, Sustainable Coconut Shell Carbon
Housing
SHIELD Core with Integrated Bypass, Flow Meter, SHIELD IQ Controller
Connection Size
1" MNPT
Filter Removal
Tool-Free Snap-Ring Design
Filter Certifications
NSF 61 | IAPMO
Housing Certifications
NSF/ANSI 42, 44, 53 Listed
Installation
Point-of-Entry (POE) - Professional Installation Required
Service Interval
Dealer-specified based on Water Usage and Water Chemistry - Tracked by SHIELD IQ
Dimensions
XX" x XX" x XX"
Specification
SHIELD Active Armour
(SLD-AA-300)
SHIELD SCALESTOP
(SLD-SCALESTOP)
Technology
Active Armour
ScaleStop
Peak Flow Rate
20 Gallons Per Minute (GPM)
Service Flow Rate
12 GPM
12 GPM
Media Lifespan
>100,000 gallons @ 8 GPM
>100,000 gallons @ 8 GPM
Filter Media
Highly-Activated, Sustainable Coconut Shell Carbon
Housing
SHIELD Core with Integrated Bypass, Flow Meter, SHIELD IQ Controller
Connection Size
1" MNPT
Filter Removal
Tool-Free Snap-Ring Design
Filter Certifications
NSF 61 | IAPMO
Housing Certifications
NSF/ANSI 42, 44, 53 Listed
Installation
Point-of-Entry (POE) - Professional Installation Required
Service Interval
Dealer-specified based on Water Usage and Water Chemistry - Tracked by SHIELD IQ
Dimensions
XX" x XX" x XX"
Specs
SHIELD GUARDIAN (SLD-GRD-20 /
SLD-GRD-20A)
SHIELD SCALESTOP
(SLD-SCALESTOP)
Technology
Active Armour
ScaleStop
Peak Flow Rate
20 Gallons Per Minute (GPM)
Service Flow Rate
12 GPM
12 GPM
Media Lifespan
>100,000 gallons @ 8 GPM
>100,000 gallons @ 8 GPM
Filter Media
Highly-Activated, Sustainable Coconut Shell Carbon
Housing
SHIELD Core with Integrated Bypass, Flow Meter, SHIELD IQ Controller
Connect-ion Size
1" MNPT
Filter Removal
Tool-Free Snap-Ring Design
Filter Certifica-tions
NSF ANSI 53 (lead, cyst)
NSF 61
NSF/ANSI P473 (PFOA/PFOS) | IAPMO
Housing Certifica-tions
NSF/ANSI 42, 44, 53 Listed
Install-ation
Point-of-Entry (POE) - Professional Installation Required
Service Interval
Dealer-specified based on Water Usage and Water Chemistry - Tracked by SHIELD IQ
Dimens-ions
XX" x XX" x XX"
Ready to protect your family?
Find a certified SHIELD dealer near you for water testing and expert recommendations.
Ready to protect your family?
Find a certified SHIELD dealer near you for water testing and expert recommendations.
Ready to protect your family?
Find a certified SHIELD dealer near you for water testing and expert recommendations.
Whole-home water defense. Independently certified. Professionally installed.
Always working.
© 2026 Crusader Manufacturing · All rights reserved
Whole-home water defense. Independently certified. Professionally installed.
Always working.
© 2026 Crusader Manufacturing · All rights reserved
Whole-home water defense. Independently certified. Professionally installed.
Always working.
© 2026 Crusader Manufacturing · All rights reserved
Active Armour technology
How Active Armour works
A phosphate-based approach with no salt, no regeneration, and no sodium discharge.
I Phosphate Dosing
SHIELD SCALE CONTROL introduces a precisely metered amount of food-grade phosphate into your water supply. NSF 60 certifies the phosphate formulation is safe for drinking water at the point of application - no harmful byproducts introduced.
2 Scale Crystal Interruption
Calcium carbonate scale forms when minerals crystallize and bond to pipe walls and heating surfaces. Phosphate interferes with the crystallization process - calcium and magnesium stay in solution rather than depositing as scale. This is not softening: minerals remain, they just cannot bond.
3 Protective Nano-Layer
Phosphate forms a thin protective layer on pipe interiors and metallic fixture surfaces. This layer inhibits oxidative corrosion throughout the plumbing system - protecting copper and steel pipe, faucet internals, water heater elements, and appliance surfaces from corrosion-related degradation.
4 No Salt, no Waste, no Maintenance Chemicals
Unlike traditional water softeners, SHIELD SCALE CONTROL does not require salt bags, brine tanks, or regeneration cycles. There is no sodium discharge into your drain - an important environmental distinction, and a legal requirement in some jurisdictions where salt-based softeners are regulated or banned.