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iSpring WCS45KG

Ranked #24 of 30 in Best Water Softeners (2026). Here is every spec we scored, where it came from, and how it compares.

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#24

iSpring WCS45KG

Best for: 45,000-grain whole-house softener with a backwash feature

1.1/10

What we like

    Watch out for

    • Flow rate not published by iSpring
    • Lowest warranty in this comparison (1 yr)

    Score breakdown

    Grain capacity 36%
    Flow rate * 28%
    Warranty 20%
    NSF/ANSI 44 named 16%

    * Not published by the manufacturer; scored at the lowest published value in this category, so an unpublished figure never outranks a published one.

    Grain capacity45000 gr
    Flow rateNot listed
    Warranty1 yr
    NSF/ANSI 44 namedNo
    Grain capacity (maker)45,000 grain capacity (official product name)
    Flow rate (maker)Not listed
    NSF/ANSI 44 (maker)Not listed
    Warranty (maker)1-year manufacturer warranty (official page)
    PriceCheck price
    Check price at Amazon
    Specs source:

    iSpring WCS45KG head-to-head

    Head-to-headiSpring WCS45KG vs iSpring WCSTB45KG

    How it compares

    Open the full comparison table

    Crystal Quest 120,000 Grain Commercial Softener
    6.4/10
    #1 · 120,000-grain single-tank softener listed at 60 GPM, 4 cu. ft.
    Crystal Quest 210,000 Grain Commercial Softener
    6.4/10
    #2 · 210,000-grain single-tank softener listed at 60 GPM, 7 cu. ft.
    Aquasure Signature Elite 72,000 Grains with UV
    4.2/10
    #3 · 72,000-grain Signature Elite softener with fine-mesh resin and 18 GPM UV
    Aquasure Signature 64,000 Grains with 12 GPM UV
    3.9/10
    #4 · 64,000-grain Signature softener bundled with a 12 GPM UV system and a pre-filter
    Crystal Quest 90,000 Grain Commercial Softener
    3.8/10
    #5 · 90,000-grain single-tank softener listed at 19 GPM, 3 cu. ft.
    APEC Hydro Express 30
    3.2/10
    #6 · 30,000-grain softener with a 17.6 GPM peak flow and a 5-year limited warranty
    Aquasure Signature 48,000 Grains with 12 GPM UV
    3.2/10
    #7 · 48,000-grain Signature softener bundled with a 12 GPM UV system and a pre-filter
    Aquasure Signature 32,000 Grains with 8 GPM UV
    2.6/10
    #8 · 32,000-grain Signature softener bundled with an 8 GPM UV system and a pre-filter
    Aquasure Harmony 72,000 Grains
    2.2/10
    #9 · 72,000-grain Harmony Series whole-house softener
    Aquasure Harmony 72,000 Grains Fine Mesh
    2.2/10
    #10 · 72,000-grain Harmony softener with fine-mesh resin
    Aquasure Harmony 72,000 Grains with Pre-Filter
    2.2/10
    #11 · 72,000-grain Harmony softener with a 10-inch triple-purpose pre-filter
    Aquasure Harmony 64,000 Grains
    1.9/10
    #12 · 64,000-grain Harmony Series whole-house softener
    Aquasure Harmony 64,000 Grains Fine Mesh
    1.9/10
    #13 · 64,000-grain Harmony softener with fine-mesh resin
    Aquasure Harmony 64,000 Grains with Pre-Filter
    1.9/10
    #14 · 64,000-grain Harmony softener with a 10-inch triple-purpose pre-filter
    Aquasure Signature Elite 64,000 Grains with UV
    1.9/10
    #15 · 64,000-grain Signature Elite softener with fine-mesh resin, KDF85 carbon and 18 GPM UV
    SoftPro Elite Smart HE (City Water)
    1.9/10
    #16 · 64,000-grain Elite Smart HE softener for city water
    APEC Hydro Express 45
    1.8/10
    #17 · 45,000-grain softener with a 17.6 GPM peak flow
    Crystal Quest 60,000 Grain Commercial Softener
    1.7/10
    #18 · 60,000-grain single-tank softener listed at 12 GPM, 2.0 cu. ft.
    Aquasure Harmony 50,000 Grains with Pre-Filter
    1.3/10
    #19 · 50,000-grain Harmony softener with a triple-purpose pre-filter
    Aquasure Harmony 48,000 Grains
    1.2/10
    #20 · 48,000-grain Harmony Series whole-house softener
    Aquasure Harmony 48,000 Grains Fine Mesh
    1.2/10
    #21 · 48,000-grain Harmony softener with fine-mesh resin
    Aquasure Signature Elite 48,000 Grains with UV
    1.2/10
    #22 · 48,000-grain Signature Elite softener with fine-mesh resin, KDF85 carbon and 12 GPM UV
    Crystal Quest 45,000 Grain Commercial Softener
    1.1/10
    #23 · 45,000-grain single-tank softener listed at 12 GPM, 1.5 cu. ft.
    iSpring WCSTB45KG
    1.1/10
    #25 · 45,000-grain whole-house softener with automatic backwash
    Aquasure Harmony Lite 34,000 Grains
    0.7/10
    #26 · 34,000-grain all-in-one cabinet Harmony Lite softener
    Aquasure Harmony 32,000 Grains
    0.6/10
    #27 · 32,000-grain Harmony Series whole-house softener
    Aquasure Harmony 32,000 Grains Fine Mesh
    0.6/10
    #28 · 32,000-grain Harmony softener with fine-mesh resin
    Aquasure Harmony 32,000 Grains with Pre-Filter
    0.6/10
    #29 · 32,000-grain Harmony softener with a 10-inch triple-purpose pre-filter
    Aquasure Harmony Lite 32,000 Grains
    0.6/10
    #30 · 32,000-grain all-in-one cabinet Harmony Lite softener