Water Hardness Breakdown for Sector GY1 4
Water testing audits for postcode sector GY1 4 confirm a mean calcium carbonate concentration of 140 PPM, equivalent to 9.8° Clark or 14.0°fH. Sourced and treated by Guernsey Water across 143 postcode delivery routes, water in this catchment is categorized as slightly hard.
With a balanced reading of 140 PPM (9.8° Clark), water in GY1 4 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%).
The water supply managed by Guernsey Water in this region is primarily abstracted from upland reservoirs, lakes, and moorland catchments with impermeable granite or sandstone geology. This geological pathway limits mineral leaching, maintaining a low-to-moderate hardness baseline of 140 PPM throughout GY1 4.
Household water chemistry in GY1 4 (9.8° Clark) dictates everyday cleaning efficiency. Water supplied by Guernsey Water 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 GY1 4 should be calibrated precisely for 140 PPM. For Bosch, Neff, and Siemens appliances, the recommended salt dosing index is H01. Explore our interactive configuration tool below to verify exact settings for Beko, Miele, and Whirlpool units.