Postcode is the first clue.
It identifies a broad area, not the pipe feeding your home. Water sources and blending can change within one town.
Stop guessing when to descale.
Use your postcode for a broad hardness warning, then verify the supplier figure and build a machine-safe filter and maintenance routine.
No postcode storage · no universal monthly descale claim · exact-model instructions still winmg/L as CaCO₃ is the useful number.
Use the supplier’s current report or a suitable test, then select the closest exact-machine hardness setting.
Filter capacity is finite.
A cartridge is not permanent protection. Record its installation and replace it by capacity, prompt and maker instructions.
Quick answers
Water questions that prevent expensive mistakes.
Can a postcode give an exact water-hardness result?
No. A postcode area is only a broad screen because supply zones can cross postcode boundaries and can change. Confirm the current mg/L as CaCO3 figure with the water supplier or a suitable test before changing machine settings.
Does hard water mean I should descale every month?
Not automatically. Set the correct hardness, use compatible filtration where supported, record filter capacity and follow the exact machine prompt and manual. Extra chemical cycles can be unnecessary or harmful.
Does a filter remove the need to descale?
No universal filter makes that promise. Cartridge chemistry, capacity, starting hardness, water use and the machine programme all matter. Replace only a compatible filter and follow the manufacturer schedule.
Continue with the exact model