We may earn a commission when you buy through our links. Rankings are formula-based and never paid for. As an Amazon Associate I earn from qualifying purchases. Disclosure

iSpring WCSTB45KG

Ranked #25 of 30 in Best Water Softeners (2026). Here is every spec we scored, where it came from, and how it compares.

Affiliate disclosure: We earn a commission if you buy through links on this page, at no extra cost to you. It never affects our rankings, which come from the published scoring formula. As an Amazon Associate I earn from qualifying purchases. Learn more.

#25

iSpring WCSTB45KG

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

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    * Not published by the manufacturer; scored at the lowest published value in this category, so an unpublished figure never outranks a published one.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 grains (official product name)
    Flow rate (maker)Not listed
    NSF/ANSI 44 (maker)Not listed
    Warranty (maker)1-year manufacturer warranty (official page)
    Features (maker)Automatic backwash and regeneration
    PriceCheck price
    Check price at Amazon
    Specs source:

    iSpring WCSTB45KG 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 WCS45KG
    1.1/10
    #24 · 45,000-grain whole-house softener with a backwash feature
    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