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 WS7 9 vs Sector SW1A 1

Comparing tap water mineral concentration between Sector WS7 9 (South Staffordshire Water) and Sector SW1A 1 (Thames Water) reveals a water hardness difference of 25 PPM. Sector SW1A 1 has softer water at 275 PPM (Hard) compared to Sector WS7 9 at 300 PPM (Very Hard).

Limescale risk and boiler heating efficiency vary based on these mineral levels. Households in Sector WS7 9 experience higher heating element degradation and kettle scale accumulation due to elevated calcium carbonate density (300 PPM vs 275 PPM).

For home appliance setup, Bosch dishwasher water softener settings should be calibrated accordingly: Sector WS7 9 requires setting H07 (Max Salt) whereas Sector SW1A 1 recommends setting H04.

NP

Sector SW1A 1 has 25 PPM LOWER water hardness than Sector WS7 9

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

Water Metric
Sector WS7 9Outcode: WS7
Sector SW1A 1Outcode: SW1A
Hardness (PPM)
300 PPM
275 PPM
Clark Degrees
21 °Clark
19.3 °Clark
Classification
Very Hard
Hard
Bosch Salt Setting
H07 (Max Salt)
H04
Water Supplier
South Staffordshire Water
Thames Water
Postcodes Covered
138 postcodes
66 postcodes