Side-by-Side Water Hardness Calculator

Compare Water Hardness

Analyze real-time PPM, Clark degrees, limescale risk, and dishwasher salt settings between any two UK postcode sectors.

Water Quality Comparison Analysis

Executive Summary: Sector CO7 9 vs Sector SW1A 1

Comparing tap water mineral concentration between Sector CO7 9 (Affinity Water) and Sector SW1A 1 (Thames Water) reveals a water hardness difference of 15 PPM. Sector SW1A 1 has softer water at 275 PPM (Hard) compared to Sector CO7 9 at 290 PPM (Hard).

Limescale risk and boiler heating efficiency vary based on these mineral levels. Households in Sector CO7 9 experience higher heating element degradation and kettle scale accumulation due to elevated calcium carbonate density (290 PPM vs 275 PPM).

For home appliance setup, Bosch dishwasher water softener settings should be calibrated accordingly: Sector CO7 9 requires setting H04 whereas Sector SW1A 1 recommends setting H04.

Sector SW1A 1 has 15 PPM LOWER water hardness than Sector CO7 9

Lower PPM indicates softer water, reduced limescale risk, and lower detergent usage.

Water Metric
Sector CO7 9Outcode: CO7
Sector SW1A 1Outcode: SW1A
Hardness (PPM)
290 PPM
275 PPM
Clark Degrees
20.3 °Clark
19.3 °Clark
Classification
Hard
Hard
Bosch Salt Setting
H04
H04
Water Supplier
Affinity Water
Thames Water
Postcodes Covered
243 postcodes
66 postcodes