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Hard Water (Calcium & Magnesium) in Drinking Water

Excess calcium and magnesium minerals causing scale buildup, appliance damage, and dry skin/hair.

Key Facts

EPA Limit
No federal limit (>120 mg/L considered hard) mg/L (as CaCO3)
Health Effects
Dry skin and hair, Eczema flare-ups, Scale buildup in pipes and appliances
Common Sources
Limestone and dolomite aquifers, Chalk and gypsum deposits, Groundwater in the midwest and southwest US

Hard Water (Calcium & Magnesium) Guide

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Best Water FiltersCompare product roundups and top picks for this contaminant.
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How to RemoveSee the treatment methods that fit this contaminant and water source.
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How to TestLearn how to confirm levels with home kits or certified labs.
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Health EffectsUnderstand where exposure matters most and who is most sensitive.
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In Well WaterSee how this contaminant shows up in private well systems.
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Treatment CostEstimate testing, equipment, installation, and upkeep costs.

Top Recommended Filters for Hard Water (Calcium & Magnesium)

Top Pick
SpringWell Salt-Based Water Softener

SpringWell

SpringWell Salt-Based Water Softener

Smart salt-based water softener with Bluetooth control that eliminates hard water scale and protects plumbing and appliances.

Best for: Homes with moderate to extreme hard water causing scale, dry skin, and appliance damage

  • Metered on-demand regeneration saves salt and water
  • Bluetooth-enabled head for monitoring and control
  • Effective up to 81 GPG hardness
$1,549.99Check Price
SoftPro Elite Water Softener

SoftPro

SoftPro Elite Water Softener

High-efficiency upflow water softener that uses 75% less salt than conventional models with fine-mesh iron removal.

Best for: Value-oriented homeowners wanting premium softening performance with lower salt usage

  • High-efficiency upflow regeneration uses 75% less salt
  • Precision brining saves water during regeneration
  • Digital metered valve with touchscreen display
$799.00Check Price
Pelican PSE1800 Whole House Filter & Softener Combo

Pelican

Pelican PSE1800 Whole House Filter & Softener Combo

All-in-one whole-house carbon filter and salt-free water conditioner that requires no salt, electricity, or drain line.

Best for: Eco-conscious homeowners wanting both filtration and salt-free conditioning without waste water

  • Combined filtration and salt-free softening in one system
  • NaturSoft salt-free technology — no salt, no waste water
  • 5-micron pre-filter + carbon media for chlorine removal
$2,388.00Check Price
See all Hard Water (Calcium & Magnesium) water filters

Related Contaminants

🟠Iron