Water Hardness Breakdown for Sector SO18 1
Water testing audits for postcode sector SO18 1 confirm a mean calcium carbonate concentration of 280 PPM, equivalent to 19.6° Clark or 28.0°fH. Sourced and treated by Southern Water across 193 postcode delivery routes, water in this catchment is categorized as hard.
Registering 280 PPM, tap water across SO18 1's 193 postcodes carries significant calcium concentrations. Uninhibited hot water use accelerates limescale deposits on heating elements, potentially causing a 10% – 15% loss in boiler heat transfer efficiency over prolonged operating cycles.
Water distributed by Southern Water in this southeastern/eastern catchment is predominantly drawn from underground chalk and limestone aquifers. As rainwater filters through deep subterranean chalk strata, it naturally dissolves high concentrations of calcium bicarbonate, resulting in the consistent 280 PPM profile recorded across sector SO18 1.
Household water chemistry in SO18 1 (19.6° Clark) dictates everyday cleaning efficiency. Water supplied by Southern Water at this level necessitates +35% extra laundry detergent to overcome calcium neutralization, 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 SO18 1 should be calibrated precisely for 280 PPM. For Bosch, Neff, and Siemens appliances, the recommended salt dosing index is H04. Explore our interactive configuration tool below to verify exact settings for Beko, Miele, and Whirlpool units.