This sounds like one of those typical “life hacks” that are currently making the rounds on the internet! Behind the so-called salt trick for the toilet are actually some pretty clever physical and chemical effects that can solve everyday bathroom problems in a very simple way.
Here’s what happens when you pour a cup of salt (preferably inexpensive, coarse table salt or rock salt) into the toilet in the evening and let it sit overnight:
What problems does the salt trick solve?
- It combats bad odors (neutralization)
Moisture, limescale, and stagnant water in the bend of the drainpipe (the siphon) can release unpleasant, musty odors over time.
How the salt helps: Salt is extremely hygroscopic (attracts water) and has a strong odor-neutralizing effect. It binds moisture in the deposits and deprives odor-causing bacteria of their breeding ground.
- It clears minor blockages and prevents them.
Over time, limescale, urine scale, and soap scum build up on the inside of pipes, narrowing the drain.
How salt helps: When you add salt to the toilet with warm (not boiling!) water, it acts like a gentle abrasive. The salty solution softens organic deposits and limescale overnight, so they are easily flushed away the next time you flush.
- It keeps flies and pests away.
Especially in summer, tiny drain flies like to nest in damp drains, laying their eggs in the organic deposits in the pipe.
How salt helps: The salty environment is extremely hostile to the larvae and eggs of these insects. The salt dries them out and prevents unwanted guests from taking up residence in your bathroom.
How to Use the Salt Trick Correctly
For maximum effect, follow these steps:
Preparation: Late in the evening (when the toilet won’t be used for a few hours), pour about 150 to 200 grams of salt (approximately one cup) directly into the toilet bowl.
The Booster (optional): For stubborn limescale or light urine scale, you can add a splash of vinegar or a tablespoon of baking soda. It will start fizzing – that’s the cleaning effect.
Let it Work: Leave it overnight (at least 6 to 8 hours).
Flush: The next morning, pour a bucket of warm (not boiling, as ceramic can crack with extreme temperature changes!) water down the bowl and flush normally.
Safety Note: Do not use this trick immediately after using chemical drain cleaners. The combination of household remedies and strong chemicals can produce dangerous, toxic fumes.
Is there a catch?
For regular maintenance and to combat minor odors, this trick is ingenious, inexpensive, and environmentally friendly. However, in the case of a severe, deep blockage (e.g., caused by too much toilet paper or hygiene products), salt reaches its limits – in such cases, only a classic plunger or a drain cleaning auger will help.