SoftenrySoft water, sized right.

Softeners · Salt · Iron · Valve parts

Soft water, sized right.

Enter your hardness, your household and your bathrooms. The grains your softener has to remove each week are worked out live, and every softener we cover is checked against it at an efficient salt setting, with the control valve it runs named on each one.

Compare water softeners Find parts for your valve
A row of fiberglass mineral tanks with control valves on top, plumbed together with blue pipe
Softener size checkWhole-house softeners
Resin Brine About 25,800 grains a week 9 GPM peak

85 softeners state a grain capacity

  1. On The Go OTG3NTP3M 8,000-Grain Portable Water Softener8,000 grains rated · about 6,000 at an efficient salt setting
  2. On The Go OTG4-StdSoft 8,000-Grain Portable Water Softener8,000 grains rated · about 6,000 at an efficient salt setting · 2.0 GPM
  3. Watts RV PRO-1000 OR M7002 10,000-Grain Portable Water Softener10,000 grains rated · about 7,500 at an efficient salt setting · 4.0 GPM
  4. DAORBT FCRSQ12000GRAWO21001V0 12,000-Grain Portable Water Softener12,000 grains rated · about 9,000 at an efficient salt setting
  5. CircleRiver 16000 16,000-Grain Portable Water Softener16,000 grains rated · about 12,000 at an efficient salt setting
  6. CooFel-DAI-23 16,000-Grain Water Softener and Filter System16,000 grains rated · about 12,000 at an efficient salt setting
  7. Filterelated 16000 16,000-Grain Portable Water Softener16,000 grains rated · about 12,000 at an efficient salt setting
  8. Kay&J ws01 16,000-Grain Portable Water Softener16,000 grains rated · about 12,000 at an efficient salt setting
  9. NPGLOBAL NPG-124 16,000-Grain Portable Water Softener16,000 grains rated · about 12,000 at an efficient salt setting
  10. NPGLOBAL WS-8000 16,000-Grain Water Softener and Filter System16,000 grains rated · about 12,000 at an efficient salt setting
  11. On The Go OTG4-DBLSOFT 16,000-Grain Portable Water Softener16,000 grains rated · about 12,000 at an efficient salt setting
  12. PRO+AQUA WS-P-16-BNDL 16,000-Grain Portable Water Softener16,000 grains rated · about 12,000 at an efficient salt setting · 5.0 GPM
  13. RVGUARD RGRWS-160 16,000-Grain Portable Water Softener16,000 grains rated · about 12,000 at an efficient salt setting
  14. VEVOR PRS-307RSG 16,000-Grain Portable Water Softener16,000 grains rated · about 12,000 at an efficient salt setting
  15. VEVOR PRS-308RSGL 16,000-Grain Water Softener and Filter System16,000 grains rated · about 12,000 at an efficient salt setting
  16. VEVOR RWS16000 16,000-Grain Water Softener and Filter System16,000 grains rated · about 12,000 at an efficient salt setting
  17. AFWFilters Fleck 5600SXT 24,000-Grain Water Softener and Filter System24,000 grains rated · about 18,000 at an efficient salt setting · Fleck 5600SXT
  18. PRO+AQUA PRO-E-S25E 25,000-Grain Water Softener and Filter System25,000 grains rated · about 18,800 at an efficient salt setting
  19. Aquasure Harmony Series AS-HS30FMZ 30,000-Grain Water Softener and Filter System30,000 grains rated · about 22,500 at an efficient salt setting
  20. EcoPure EP31 31,000-Grain Water Softener31,000 grains rated · about 23,200 at an efficient salt setting
  21. AFWFilters Fleck 2510SXT 32,000-Grain Water Softener and Filter System32,000 grains rated · about 24,000 at an efficient salt setting · Fleck 2510SXT
  22. AFWFilters Fleck 5600SXT 16,000-Grain Water Softener16,000 grains rated · about 24,000 at an efficient salt setting · 8.0 GPM · Fleck 5600SXT
  23. AFWFilters Fleck 5600SXT 32,000-Grain Water Softener32,000 grains rated · about 24,000 at an efficient salt setting · 12.0 GPM · Fleck 5600SXT
  24. Abundant Flow Water Systems Iron Pro Fleck 2510SXT 32,000-Grain Water Softener and Filter System32,000 grains rated · about 24,000 at an efficient salt setting · Fleck 2510SXT
  25. Aquasure AS-PR75AHS32D 32,000-Grain Water Softener and Filter System32,000 grains rated · about 24,000 at an efficient salt setting
  26. Aquasure Harmony Series AS-HS32D 32,000-Grain Water Softener32,000 grains rated · about 24,000 at an efficient salt setting
  27. DuraWater Fleck 5600SXT 32,000-Grain Water Softener32,000 grains rated · about 24,000 at an efficient salt setting · Fleck 5600 SXT
  28. Fleck 5600SXT 32,000-Grain Water Softener32,000 grains rated · about 24,000 at an efficient salt setting · Fleck 5600 SXT
  29. Kenmore 350 32,000-Grain Water Softener32,000 grains rated · about 24,000 at an efficient salt setting · 7.2 GPM
  30. Tier1 WS-165-132 32,000-Grain Water Softener32,000 grains rated · about 24,000 at an efficient salt setting · 18.0 GPM
  31. Aquasure Harmony AS-HL34A 34,000-Grain Water Softener and Filter System34,000 grains rated · about 25,500 at an efficient salt setting · 3.1 GPM
  32. VEVOR BWsoftYT-5w 40,000-Grain Water Softener40,000 grains rated · about 29,800 at an efficient salt setting · 15.0 GPM
  33. Aquasana WH-SF40 40,000-Grain Water Softener40,000 grains rated · about 30,000 at an efficient salt setting · 15.5 GPM
  34. Aquasana WH-SF40-BASE 40,000-Grain Water Softener40,000 grains rated · about 30,000 at an efficient salt setting · 15.5 GPM
  35. Aquasure Harmony Series AS-HS40SCZ 40,000-Grain Water Softener40,000 grains rated · about 30,000 at an efficient salt setting
  36. Kenmore 420 40,000-Grain Water Softener and Filter System40,000 grains rated · about 30,000 at an efficient salt setting · 7.7 GPM
  37. SoftPro Water Systems SoftPro 40k 40,000-Grain Water Softener40,000 grains rated · about 30,000 at an efficient salt setting
  38. EcoPure EP42 42,000-Grain Water Softener and Filter System42,000 grains rated · about 31,500 at an efficient salt setting
  39. PRO+AQUA PRO-S-45E 45,000-Grain Water Softener45,000 grains rated · about 33,800 at an efficient salt setting
  40. iSpring WCS45KG 45,000-Grain Water Softener45,000 grains rated · about 33,800 at an efficient salt setting
  41. iSpring WCSTB45KG 45,000-Grain Water Softener45,000 grains rated · about 33,800 at an efficient salt setting
  42. AFWFilters Fleck 2510SXT 48,000-Grain Water Softener and Filter System48,000 grains rated · about 36,000 at an efficient salt setting · Fleck 2510SXT
  43. AFWFilters Fleck 5600SXT 1.5 cu ft Water Softener48,000 grains rated · about 36,000 at an efficient salt setting · 14.0 GPM · Fleck 5600SXT
  44. AFWFilters Fleck 5600SXT 48,000-Grain Water Softener48,000 grains rated · about 36,000 at an efficient salt setting · Fleck 5600sxt
  45. AFWFilters Fleck 5600SXT 48,000-Grain Water Softener and Filter System48,000 grains rated · about 36,000 at an efficient salt setting · 12.0 GPM · Fleck 5600sxt
  46. AFWFilters IRON Pro 2 Fleck 5600SXT 48,000-Grain Water Softener and Filter System48,000 grains rated · about 36,000 at an efficient salt setting · Fleck 5600Sxt
  47. AFWFilters Iron Pro Fleck 2510SXT 48,000-Grain Water Softener and Filter System48,000 grains rated · about 36,000 at an efficient salt setting · Fleck 2510sxt
  48. Aquasure AS-PR75HS48D 48,000-Grain Water Softener and Filter System48,000 grains rated · about 36,000 at an efficient salt setting · 15.0 GPM
  49. Aquasure AS-WHF48D 48,000-Grain Water Softener and Filter System48,000 grains rated · about 36,000 at an efficient salt setting
  50. Aquasure Elite AS-SE1000A 48,000-Grain Water Softener and Filter System48,000 grains rated · about 36,000 at an efficient salt setting
  51. Aquasure Harmony Series 48000FM 48,000-Grain Water Softener and Filter System48,000 grains rated · about 36,000 at an efficient salt setting · 18.0 GPM
  52. Aquasure Harmony Series AS-HS48D 48,000-Grain Water Softener48,000 grains rated · about 36,000 at an efficient salt setting · 12.0 GPM
  53. Aquasure Harmony Series AS-HS48FM 48,000-Grain Water Softener and Filter System48,000 grains rated · about 36,000 at an efficient salt setting · 15.0 GPM
  54. Aquasure Harmony Series AS-HS48SCP 48,000-Grain Water Softener and Filter System48,000 grains rated · about 36,000 at an efficient salt setting · 5.0 GPM
  55. DuraWater 48k-56sxt-10AL 48,000-Grain Water Softener48,000 grains rated · about 36,000 at an efficient salt setting · Fleck 5600 SXT
  56. DuraWater Fleck 5600 48k 48,000-Grain Water Softener48,000 grains rated · about 36,000 at an efficient salt setting
  57. DuraWater Fleck 5600SXT 48,000-Grain Water Softener48,000 grains rated · about 36,000 at an efficient salt setting · Fleck 5600 SXT
  58. DuraWater Fleck 5600SXT 48,000-Grain Water Softener and Filter System48,000 grains rated · about 36,000 at an efficient salt setting
  59. Fleck 5600SXT 48,000-Grain Water Softener48,000 grains rated · about 36,000 at an efficient salt setting · Fleck 5600 SXT
  60. Fleck 5600SXT 48,000-Grain Water Softener and Filter System48,000 grains rated · about 36,000 at an efficient salt setting · Fleck 5600 SXT
  61. Fleck 9100 SXT 48,000-Grain Twin-Tank Water Softener48,000 grains rated · about 36,000 at an efficient salt setting · Fleck 9100
  62. Premier Water Systems Fleck 5600 WHWS1054 48,000-Grain Water Softener48,000 grains rated · about 36,000 at an efficient salt setting · 12.0 GPM · fleck 5600
  63. Premier Water Systems WHS48K-56SM 48,000-Grain Water Softener48,000 grains rated · about 36,000 at an efficient salt setting · 12.0 GPM
  64. Tier1 WS-165-150 48,000-Grain Water Softener48,000 grains rated · about 36,000 at an efficient salt setting · 18.0 GPM
  65. Aquasure Harmony Series AS-HS50SCZ 50,000-Grain Water Softener and Filter System50,000 grains rated · about 37,500 at an efficient salt setting
  66. iSpring WCS50KG 50,000-Grain Water Softener50,000 grains rated · about 37,500 at an efficient salt setting
  67. Aquasana WH-SF60-BASE 60,000-Grain Water Softener60,000 grains rated · about 45,000 at an efficient salt setting · 16.6 GPM
  68. AFWFilters Fleck 5600SXT 64,000-Grain Water Softener64,000 grains rated · about 48,000 at an efficient salt setting · Fleck 5600 SXT
  69. AFWFilters Fleck 5600SXT 64,000-Grain Water Softener and Filter System64,000 grains rated · about 48,000 at an efficient salt setting · Fleck 5600SXT
  70. AFWFilters Fleck 9100SXT 64,000-Grain Water Softener and Filter System64,000 grains rated · about 48,000 at an efficient salt setting · Fleck 9100SXT
  71. AFWFilters Iron Pro 2 Fleck 5600SXT 64,000-Grain Water Softener and Filter System64,000 grains rated · about 48,000 at an efficient salt setting · Fleck 5600SXT
  72. Aquasure AS-PR75HS64D 64,000-Grain Water Softener and Filter System64,000 grains rated · about 48,000 at an efficient salt setting · 1.3 GPM
  73. Aquasure AS-WHF64D 64,000-Grain Water Softener and Filter System64,000 grains rated · about 48,000 at an efficient salt setting · 3.1 GPM
  74. Aquasure Harmony Series AS-HS64FM 64,000-Grain Water Softener64,000 grains rated · about 48,000 at an efficient salt setting · 20.0 GPM
  75. Aquasure Harmony Series AS-HS64SCP 64,000-Grain Water Softener64,000 grains rated · about 48,000 at an efficient salt setting · 18.0 GPM
  76. Aquasure Harmony Series HS64FM 64,000-Grain Water Softener and Filter System64,000 grains rated · about 48,000 at an efficient salt setting · 18.0 GPM
  77. Aquasure Harmony Series WS-EM-64 64,000-Grain Water Softener64,000 grains rated · about 48,000 at an efficient salt setting · 13.3 GPM
  78. VEVOR BWsoftFT-6.4w 64,000-Grain Water Softener64,000 grains rated · about 50,900 at an efficient salt setting
  79. Aquasure Harmony Series AS-HS70FMZ 70,000-Grain Water Softener and Filter System70,000 grains rated · about 52,500 at an efficient salt setting
  80. Aquasure Harmony Series AS-HS72D 72,000-Grain Water Softener72,000 grains rated · about 54,000 at an efficient salt setting
  81. Aquasure Harmony Series AS-HS72SCZ 72,000-Grain Water Softener and Filter System72,000 grains rated · about 54,000 at an efficient salt setting
  82. AFWFilters Fleck 2510SXT 80,000-Grain Water Softener and Filter System80,000 grains rated · about 60,000 at an efficient salt setting · Fleck 2510SXT
  83. Fleck 5600 56M24R N1354H 80,000-Grain Water Softener80,000 grains rated · about 60,000 at an efficient salt setting · 12.0 GPM · Fleck 5600
  84. PRO+AQUA PRO-S-80E 80,000-Grain Water Softener80,000 grains rated · about 60,000 at an efficient salt setting
  85. AFWFilters Fleck 2510SXT 96,000-Grain Water Softener and Filter System96,000 grains rated · about 72,000 at an efficient salt setting · Fleck 2510SXT
Full sizing, with your own water use and salt setting

Decide with numbers

Calculators and quick answers

Our sizing tools use the same maker figures as our product pages and print their working.

Softener size

Hardness, iron and household to grains a week, and the softeners that keep up at an efficient salt setting.

Valve parts lookup

Pick your Fleck, Clack or Autotrol valve and see the rebuild kits, pistons, bypasses and floats that name it.

Hardness converter

mg/L, ppm or German degrees to grains per gallon, with the band your water falls in.

Everything we cover

From the hardness test to the last bag of salt

Each category lists every model we cover on one grid, with the maker figures that decide the purchase.

Aquasure Harmony Series AS-HS48D 48,000-Grain Water SoftenerWater SoftenersSalt-based softeners by grain capacity, service flow and the control valve they run.99modelsMorton 40 lb Softener Salt PelletsSoftener SaltPellets, solar crystals, potassium chloride and rust-defense salt by bag size and purity.26modelsiSpring WCFM400K Air-Injection Iron FilterIron and Sulfur FiltersAir-injection, media and cartridge filters for iron, manganese and sulfur in well water.19modelsNuvoH2O HHP-2516 Salt-Free Conditioner and Filter SystemSalt-Free ConditionersTAC conditioners and electronic descalers by flow and the hardness they are rated for.35modelsFleck 5600SXT Metered Control ValveControl ValvesFleck, Clack and Autotrol heads, rebuild kits, pistons, boards and meters by the valve they fit.52modelsPurolite C100E 1 cu ft Softener ResinSoftener ResinReplacement cation resin and filter media by volume, crosslink and mesh.27modelsDuraWater 1833 18x33 Brine TankBrine Tanks and Softener PartsBrine tanks, safety floats, bypass valves and mineral tanks by size and part number.46modelsHach 145300 Hardness Test KitHardness TestingStrips, drop kits and digital testers to read your hardness before you size anything.14models
A close-up of white salt pellets

Most softener mistakes are a sizing mistake: a box chosen by its grain rating instead of by the hardness and the household it has to serve.

Hard-water help

Read your water first

Resin8% vs 10% crosslink resinIronAir Injection vs Media Iron FiltersSaltBest Softener Salt for Water With IronPartsBrine Tank Safety Float: How It WorksBuying guideCabinet vs Two-Tank Water SoftenersHow-toClack WS1 Valve Rebuild: Parts and StepsIndexAll hard-water help

Shortlists and side-by-sides

Every rule printed with the pick

ShortlistHigh-Capacity Water Softeners for Large HouseholdsShortlistWater Softeners for Small Homes and CouplesShortlistWater Softeners for Families of Three to FiveShortlistPortable Water Softeners for RVs and BoatsShortlistWater Softener and Filter Combination SystemsShortlistWater Softeners Built on a Fleck ValveSide by sideAFWFilters Fleck 2510SXT 48,000 vs AFWFilters Fleck 5600SXT 48,000Side by sideAquasure Harmony AS-HS48D vs iSpring WCS45KGSide by sideAquasure Harmony 48,000 vs AFWFilters Fleck 5600SXT 48,000Side by sideAquasure Harmony 48,000 vs DuraWater Fleck 5600SXT 48,000

How Softenry works

A reference, not a review blog

The makers' numbers

Grain capacity, service flow, resin volume and the valve each unit runs come from the maker's or seller's own listing. Where a figure isn't stated, we print "Not stated" instead of guessing.

Capacity you can actually use

Grain ratings are full-salt figures. Our sizing works at an efficient salt setting, about three quarters of the rating, so the unit we list keeps up without wasting salt.

The valve, named

Every softener and filter shows the control valve it is built on, so you can find the rebuild kit, piston or float that fits it later. Where our numbers come from.