Water Hardness Breakdown for Sector HR4 9
Water testing audits for postcode sector HR4 9 confirm a mean calcium carbonate concentration of 150 PPM, equivalent to 10.5° Clark or 15.0°fH. Sourced and treated by Severn Trent / Hafren Dyfrdwy across 240 postcode delivery routes, water in this catchment is categorized as moderately hard.
With a balanced reading of 150 PPM (10.5° Clark), water in HR4 9 exhibits a moderate mineral structure. While limescale accumulation is gradual, minor scale rings can form inside kettles and on boiler heat exchangers over 6–12 month periods (estimated thermal efficiency drag of 4% – 7%).
Supplies in this zone are managed through a composite blend of river abstraction points and upland reservoirs operated by Severn Trent / Hafren Dyfrdwy. The mineral balance fluctuates moderately between seasons, averaging 150 PPM (10.5° Clark) across the 240 postal sectors in this supply matrix.
Household water chemistry in HR4 9 (10.5° Clark) dictates everyday cleaning efficiency. Water supplied by Severn Trent / Hafren Dyfrdwy at this level necessitates medium detergent volume with routine machine descaling, while inline shower head filters can help sensitive skin by mitigating mineral residue during washing.
To preserve internal ion-exchange resin chambers, domestic dishwashers operating in sector HR4 9 should be calibrated precisely for 150 PPM. For Bosch, Neff, and Siemens appliances, the recommended salt dosing index is H02. Explore our interactive configuration tool below to verify exact settings for Beko, Miele, and Whirlpool units.