Water Hardness Breakdown for Sector GU5 9
Covering 178 active delivery postcodes in the GU5 district, households and businesses in sector GU5 9 are supplied with tap water averaging 280 PPM (19.6° Clark). Distributed under the regulatory oversight of Thames Water, local tap water supplies in this catchment are rated as very hard.
Registering 280 PPM, tap water across GU5 9's 178 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 Thames 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 GU5 9.
In everyday household use, calcium and magnesium ions in 280 PPM water bind with soaps, producing chalky bathroom residue and scum on your morning cuppa. In sector GU5 9, washing laundry or dishware requires +35% extra laundry detergent to overcome calcium neutralization. For personal grooming, individuals with dry skin or eczema sensitivity may experience skin tightness after showers in this very hard water environment.
Calibrating appliance water softening systems in GU5 9 prevents etched glassware and heating element burnouts. Based on Thames Water's official 280 PPM rating, Bosch dishwashers should be set to H05. Consult the interactive equipment guide below for custom brand settings across all 178 postcodes.