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Independent product analysis

Kenmore 420 Water Softener (40,000-grain)

A certified (NSF/ANSI 44) salt-based softener for scale and appliance protection. Hardness is an aesthetic issue, not a health finding.

Kenmore · 625.384200
  • Whole-House System
  • Ion Exchange
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Fit for your water

Certified for 3 targets

  • Eligible: current record covers it
  • Not established, with the reason

A target listed here does not mean that contaminant is present in your water.

How to verify a certified claim →Verify in the certifier’s registry ↗

PurityMap analysis · bottom line

A certified (NSF/ANSI 44) salt-based softener for scale and appliance protection. Hardness is an aesthetic issue, not a health finding.

Match factors
  • ✓ NSF/ANSI 44 certified, verified hardness capacity
  • ✓ Efficiency rated
Watch-outs
  • – Adds some sodium
  • – Needs a drain and installation

Limitations and trade-offs

  • Hardness is an aesthetic and appliance issue, not a health finding.
  • Adds some sodium to softened water.
  • Not a lead, PFAS or chlorine solution.
  • Adds some sodium to softened water
  • Uses salt and needs periodic refills
  • Needs a drain and professional install

No filter treats every water problem. This analysis does not replace household testing, installation requirements, or the manufacturer’s current performance data sheet.

Not suitable for

  • Treating only the drinking-water tap
  • Lead from plumbing after the point it treats
  • Anyone who can't plumb, drill or hire an installer
  • Renters who can't modify plumbing

Installation, ownership and maintenance

Manufacturer
Kenmore
Model number
625.384200
Installation format
Whole-House System
Dimensions
Main-line softener with a brine tank; needs a drain
Typical annual upkeep
$120

Certification last checked Oct 7, 2026

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Where to buy

Amazon listing title

Kenmore 420 Water Softener System – 40,000 Grain Capacity with Salt Saving Technology – Whole Home Hard Water & Iron Reduction – Compact, Easy Install

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