Water softeners

Ion-exchange softeners swap calcium and magnesium for sodium or potassium. They address hardness — scale, spots, poor lather — and nothing else.

What it does

• Reduces scale buildup on fixtures, water heaters and appliances
• Improves soap lather and reduces spotting on dishes and glass
• Protects appliance efficiency and lifespan where hardness is measured and high

What it does not do

• It is not a filter — it does not address chlorine, lead, PFAS, bacteria or taste
• It does not make water safer; hardness is a comfort and cost issue, not a health hazard
• Salt-free "conditioners" alter scale behavior but do not remove hardness minerals — a different product with different trade-offs

How sizing works

Grain capacity is calculated from measured hardness (grains per gallon), household size and bathrooms. An oversized unit wastes salt and water; an undersized one lets hardness through. That's why a measured value — from your utility's report, a $12 strip or a lab test — comes before any purchase.