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Hardness

Hardness
The hardness of water is a measure of its soap-consuming capacity; in practice it corresponds to the calcium and magnesium salts. Boilers usually require feed water of low hardness not only to avoid scale formation on heat transfer surfaces but also to minimise the formation of suspended solids or sludge in the boilers.
Hardness salts are not normally removed from potable water where, in the UK, their concentration can vary dramatically depending on the type of rock strata/run-off surface the water comes into contact with.
Title Test Name Measuring Range Method No. Product Type Mark as favourite
Hardness total HR T 20 - 500 mg/l CaCO3 i)
  • M201
Photometer
Hardness Calcium (B) T 20 - 500 mg/l CaCO3
  • M191
Photometer
Hardness total T 2 - 50 mg/l CaCO3
  • M200
Photometer
Hardness Calcium (B) T 50 - 900 mg/l CaCO3
  • M190
Photometer
Hardness residual 1 drop = 0.1 or 0.05 °dH Test Kit
Hardness Total (new version) + Carbonate GKH-1 1 drop = 1 or 0.5°dH Test Kit
Hardness carbonate (new version) 1 drop = 1 or 0.5 °dH Test Kit
DIGI Hardness (Calcium) 10 - 2000 mg/l CaCO3 Test Kit
Hardness 5 - 600 mg/l CaCO3 Test Kit
Hardness, total, very low 1 - 10 mg/l CaCO3 Test Kit
Hardness, total, low 1 - 50 mg/l CaCO3 Test Kit
Hardness, total Limit 4, 8 or 20 mg/l CaCO3 Test Kit
Hardness, calcium 10 - 500 mg/l CaCO3 Test Kit
Hardness, calcium 20 - 800 mg/l CaCO3 Test Kit
Hardness 0 - 500 mg/l CaCO3 Test Kit
Hardness Total-Test Strips 40 - 1000 mg/l CaCO3 Test Kit
Hardness total P 0 - 60 mg/l CaCO3
  • M3049
Test Kit
Hardness 8 - 20 mg/l CaCO3 Test Kit
Hardness (Calcium) LR 5 - 60 mg/l CaCO3 Test Kit
Hardness 9 - 540 mg/l CaCO3 Test Kit
Hardness 10 - 300 mg/l CaCO3 Test Kit
Hardness 50 - 600 mg/l CaCO3 Test Kit
Hardness 0 - 300 mg/l CaCO3 Test Kit
Hardness 4 mg/l CaCO3 Test Kit