Dishwasher Salt & Rinse Aid: What They Do and When to Refill

To keep your dishwasher performing at its best, two products do a lot of hidden heavy lifting: dishwasher salt and rinse aid. They protect the machine, improve cleaning results and help you get sparkling dishes every time. Here’s a simple guide to what they do and how often to top them up.

What Dishwasher Salt Does

Dishwasher salt helps your appliance soften hard water. Hard water contains minerals that leave white marks, streaks and limescale on glasses and plates. By softening the water, dishwasher salt prevents this build-up and helps your detergent work properly.

When to Refill Dishwasher Salt

Most dishwashers have a salt indicator light. When it comes on, simply refill the salt compartment in the base of the dishwasher. In hard-water areas, you may need to top up more frequently—every few weeks for heavy users.

What Rinse Aid Does

Rinse aid reduces the surface tension of the water, helping it sheet off your dishes rather than drying in droplets. This leaves your dishes cleaner, drier and streak-free.

When to Refill Rinse Aid

Your dishwasher will normally alert you with a rinse aid symbol when levels are low. For most households, a refill every 3–6 weeks is typical. If you’re noticing dull glasses or wetter dishes than usual, increase the rinse aid setting slightly.

Do You Need Both?

Yes — they do completely different jobs. Salt softens the water, while rinse aid improves drying and clarity. Even if you use “all-in-one” tablets, most dishwashers still perform better with both salt and rinse aid topped up.

Related Appliances

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