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 SW1A 1 vs Sector M1 1

Comparing tap water mineral concentration between Sector SW1A 1 (Thames Water) and Sector M1 1 (United Utilities) reveals a water hardness difference of 230 PPM. Sector M1 1 has softer water at 45 PPM (Soft) compared to Sector SW1A 1 at 275 PPM (Hard).

Limescale risk and boiler heating efficiency vary based on these mineral levels. Households in Sector SW1A 1 experience higher heating element degradation and kettle scale accumulation due to elevated calcium carbonate density (275 PPM vs 45 PPM).

For home appliance setup, Bosch dishwasher water softener settings should be calibrated accordingly: Sector SW1A 1 requires setting H04 whereas Sector M1 1 recommends setting H00 (No Salt Required).

NP

Sector M1 1 has 230 PPM LOWER water hardness than Sector SW1A 1

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

Water Metric
Sector SW1A 1Outcode: SW1A
Sector M1 1Outcode: M1
Hardness (PPM)
275 PPM
45 PPM
Clark Degrees
19.3 °Clark
3.2 °Clark
Classification
Hard
Soft
Bosch Salt Setting
H04
H00 (No Salt Required)
Water Supplier
Thames Water
United Utilities
Postcodes Covered
66 postcodes
84 postcodes