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Postal Test Comparison

The table below shows the various chemical testing parameters for the postal Fernox water testing products.

Ieva Burns·August 17, 2026

Water Quality Test

Diagnostic Water Test

System Health Check

Commercial Water Quality Test

Commercial Fill Water Test

System Water Test Fields

Appearance

✅

✅

✅

✅

❌

pH

✅

✅

✅

✅

❌

Conductivity uS/cm

✅

✅

✅

✅

❌

M-Alkalinity As CaCo3 mg/L

✅

✅

✅

✅

❌

P-Alkalinity as CaC03 mg/L

❌

❌

❌

✅

❌

Total Hardness As CaCo3 mg/L

✅

✅

✅

✅

❌

Odour

❌

❌

❌

✅

❌

Suspended Solids mg/L

❌

❌

❌

✅

❌

Hardness Deposition %

✅

✅

✅

❌

❌

Calcium mg/L

❌

✅

❌

❌

❌

Magnesium mg/L

❌

✅

❌

❌

❌

Chloride mg/L

❌

✅

✅

✅

❌

Excess Chloride mg/L

❌

✅

✅

❌

❌

Lithium mg/L

❌

✅

✅

❌

❌

Sodium mg/L

❌

✅

✅

❌

❌

Potassium mg/L

❌

✅

✅

❌

❌

Molybdate mg/L

❌

❌

❌

✅

❌

Silicates mg/L

❌

❌

❌

✅

❌

Aluminium mg/L

✅

✅

✅

✅

❌

Dissolved Iron mg/L

❌

❌

❌

✅

❌

Iron mg/L

✅

✅

✅

✅

❌

Dissolved Copper mg/L

❌

❌

❌

✅

❌

Copper mg/L

✅

✅

✅

✅

❌

Total Zinc mg/L

❌

❌

❌

✅

❌

Phosphorus mg/L

✅

✅

✅

✅

❌

Boron mg/L

❌

✅

✅

✅

❌

Molybdenum mg/L

✅

✅

✅

❌

❌

Sebacate mg/L

❌

✅

✅

✅

❌

Nitrate mg/L

❌

✅

✅

✅

❌

Nitrite mg/L

❌

✅

❌

✅

❌

Sulphates mg/L

❌

✅

❌

✅

❌

Refractive Index

❌

✅

✅

✅

❌

Monoethylene Glycol %

❌

✅

❌

✅

❌

Monopropylene Glycol %

❌

✅

❌

✅

❌

Amonia mg/L

❌

❌

❌

✅

❌

Main Water Test Fields(UK Only)

Appearance

✅

✅

✅

❌

❌

pH

✅

✅

✅

❌

✅

Conductivity uS/cm

✅

✅

✅

❌

❌

M-Alkalinity As CaCo3 mg/L

✅

✅

✅

❌

❌

Total Hardness As CaCo3 mg/L

✅

✅

✅

❌

✅

Calcium mg/L

❌

✅

❌

❌

❌

Magnesium mg/L

❌

✅

❌

❌

❌

Chloride mg/L

❌

✅

✅

❌

✅

Lithium mg/L

❌

✅

❌

❌

❌

Sodium mg/L

❌

✅

❌

❌

❌

Potassium mg/L

❌

✅

❌

❌

❌

Aluminium mg/L

❌

✅

❌

❌

❌

Iron mg/L

❌

✅

❌

❌

❌

Copper mg/L

❌

✅

❌

❌

❌

Phosphorus mg/L

❌

✅

❌

❌

❌

Boron mg/L

❌

✅

❌

❌

❌

Molybdenum mg/L

❌

✅

❌

❌

❌

Sulphates mg/L

❌

❌

❌

❌

✅

Total Test Count

16

43

26

27

4

* Please note that not all postal water testing products are available for sale in all countries. For information, please contact your local Fernox Representative.

(1) For UK System Health Check and Water Quality Test samples, mains results are taken from the Fernox water testing mains database, based on samples for the same postcode. 

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