As most of the UK has "hard" water - water with a high mineral count - it’s important to use dishwasher salt to stop calcium deposits building up. Here we give you a guide to finding out your local water hardness, so you can set the ideal level of salt to keep your dishwasher functioning like the day you bought it.

The Knowhow

The minerals in hard water are not your dishwasher’s friends. Over time, they can build up into deposits, just like limescale in a kettle, and reduce the effectiveness of your machine. Using dishwasher salt "softens" the water, which reduces the mineral level and helps stop those build-ups. This has the added effect of increasing the life of your dishwasher, keeping your pots, pans and plates perfect for longer.

In order to set the optimum level of dishwasher salt, you need to know exactly how hard your water is. Your machine’s user manual will have a guide that shows you how to adjust the salt setting accordingly - the level of salt needed in the machine is generally higher the harder the water.

The best way to find out your local water hardness is from your water supplier. There are a number of these throughout the UK, and we’ve listed their websites below to help you out. It’s worth rechecking your water hardness every so often, as it can vary.
 

For Affinity Water (formerly Veolia Water) click here
For Anglian Water, click here
For Sembcorp Bournmouth Water, click here
For Bristol Water, click here
For Cambridge Water, click here
For Cholderton and District Water, click here
For Dee Valley Water, click here
For Dwr Cymru - Welsh Water, click here
For Essex and Suffolk Water, click here
For Northumbrian Water, click here
For Portsmouth Water, click here
For information from the Drinking Water Quality Regulator for Scotland, click here
For Severn Trent Water, click here
For South East Water, click here
For South Staffs Water, click here
For South West Water, click here
For Southern Water, click here
For Sutton and East Surrey Water, click here
For Thames Water, click here
For United Utilities Water, click here
For Wessex Water, click here
For Yorkshire Water, click here

Updated On:

Aug 21, 2013

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