Water Hardness Breakdown for Sector GY1 6
Public water quality records published by Guernsey Water indicate that tap water across postcode sector GY1 6 registers an average mineral hardness of 140 PPM (mg/L of calcium carbonate). Serving approximately 139 postal units in the GY1 area, this sector falls within the official slightly hard water classification.
Tap water in sector GY1 6 averages 140 PPM, presenting a manageable mineral level for the 139 local postcodes. Heating equipment operates with negligible efficiency loss (4% – 7%), though routine quarterly inspection of kettle elements remains beneficial.
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 6.
Household water chemistry in GY1 6 (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 6 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.