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You know that little cap at the bottom of your dishwasher that you’ve been ignoring? The one with what looks like a salt shaker symbol next to it? Well, it’s time we had a chat about dishwasher salt, because I bet you’re either not using it at all, or you’re scratching your head wondering how much to put in.
I’ve lost count of how many times people have asked me about this. It’s one of those things that feels mysterious until someone explains it properly. The good news? It’s actually dead simple once you know what you’re doing.
Here’s what’s happening behind the scenes: your dishwasher has a clever little water softener built in. In most of the UK, our tap water is quite hard – full of minerals like calcium and magnesium. These minerals are fine for drinking, but they’re absolute murder on your dishes and your dishwasher.
Without salt, those minerals build up as limescale on your heating element, leave white spots all over your glasses, and make your dishes look cloudy no matter how expensive your washing tablets are.
The salt regenerates your dishwasher’s water softener, basically giving it a fresh start each time. Think of it like recharging a battery – the salt helps the softener keep doing its job properly.
Now, before you dash to your kitchen cupboard, stop right there. Dishwasher salt is not the same as the stuff you put on your chips. Table salt has anti-caking agents that will clog up your softener system faster than you can say “repair bill.”
You need proper dishwasher salt – the coarse, granular stuff that looks a bit like rock salt. You’ll find it in the cleaning aisle of most supermarkets, and it’s usually pretty cheap.
The granules are larger than table salt, which means they dissolve slowly and won’t clog the system. Most brands are basically the same, so don’t worry about getting the fanciest one – just make sure it says “dishwasher salt” on the packet.
Right, here’s where people often get confused. The first time you fill the salt reservoir, you need to add water first. About a litre should do it – just pour it straight into the reservoir until it’s nearly full.
Then add the salt. Keep going until it reaches about 1cm below the cap lip, or until the reservoir is full. Don’t panic if water overflows when you’re adding salt – that’s completely normal. The salt displaces the water, and it’ll just drain away.
After this first fill, you won’t need to add water again – just top up with salt when needed. The dissolved salt creates its own brine solution.
How much salt are we talking? Most reservoirs hold about 1-2kg of salt when full. That might sound like loads, but remember, you’re not refilling it every week.
This really depends on where you live. If you’re in a hard water area (think London, much of the South East, parts of the Midlands), you’ll probably need to top up about once a month.
In Scotland or other soft water areas, you might barely need salt at all. Some people go months without refilling.
Most modern dishwashers have a little light or indicator that tells you when the salt’s running low. If your machine doesn’t have one, just check the reservoir every few weeks – you’ll soon get a feel for how quickly you get through it.
Here’s something that catches people out: even if you’re using those all-in-one tablets that claim to have salt included, you might still need to add salt separately. The amount in those tablets often isn’t enough for really hard water areas.
Your dishwasher should have a water hardness setting – usually a dial or digital setting you can adjust. Check your water company’s website to find out your local water hardness, then set your machine accordingly. This tells it how much salt to use from the reservoir.
When you’re filling up, try not to spill salt all over the dishwasher floor. If you do, wipe it up straight away – salt can be corrosive if left sitting around. If you’ve made a proper mess, run a quick rinse cycle to wash any stray granules away.
And here’s a tip from someone who learned the hard way: don’t overfill past the rim of the reservoir. You’ll just end up with salt granules floating around your dishwasher, and nobody wants that.
The biggest mistake I see? People filling right to the brim and beyond. Stop when you reach about 1cm below the cap – your dishwasher will thank you for it.
Forgetting to add water on the very first fill is another classic error. Without that initial water, the salt won’t dissolve properly and your softener won’t work.
And please, for the love of all that’s clean and sparkly, don’t use cooking salt. I know it’s tempting when you’ve run out of the proper stuff, but it’ll cause more problems than it solves.
Some people think that if a little salt is good, more must be better. Not true. Stick to the recommended amount – your dishes won’t get any cleaner, and you might damage your machine.
If your dishes are still coming out spotted or your glasses look cloudy even with salt, something’s not working properly. It might be that your water hardness setting is wrong, or there could be an issue with the softener unit itself.
Similarly, if you’re getting through salt much faster or slower than expected, it’s worth having someone take a look. A properly functioning dishwasher should be fairly predictable in its salt consumption.
If your dishwasher isn’t cleaning properly or you’re unsure about maintenance, find a trusted appliance repair and servicing professional.
Look, dishwasher salt isn’t glamorous, but it’s one of those small things that makes a big difference. Get it right, and you’ll have spotless dishes and a dishwasher that lasts for years. Get it wrong, and you’ll be wondering why your “clean” glasses look like they’ve been through a sandstorm. Trust me, it’s worth getting right the first time.