Home » Analysis of the main components of dishwashing salt and whether it is harmful for long-term use

Analysis of the main components of dishwashing salt and whether it is harmful for long-term use

by nadlia
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Before writing this article, I saw a group of people on Taiwan’s mobile01 forum discussing for more than ten pages whether edible salt can be used instead of dishwashing salt in dishwashers. As a result, most of them spoke from experience, but most of them still People think it is possible, but it is actually to save the cost of using the dishwasher.

The reason for such a discussion is that many people think that the cost of using a dishwasher is not low. I think there are still many people who don’t realize it? The single-use cost of the dishwasher may be 1~2 yuan. For the specific calculation formula, please refer to the following.

Why Do Dishwashers Need a Water Softener?

In order to achieve a good washing effect, the dishwasher needs to use soft water, that is, water that does not contain or only contains a small amount of soluble salts such as calcium and magnesium. Otherwise, white scale marks will be left on the tableware and the inner basket of the machine. It will cause scale to grow inside the machine, and even block the spray hole of the spray arm. Therefore, tap water exceeding a certain hardness must be softened by the water softener of the dishwasher to remove calcium and magnesium ions in the tap water.

How Water Softeners Work

The treatment technology used in the water softener is ion exchange through sulfonate type sodium ion exchange resin. After the tap water passes through the resin, the calcium and magnesium ions in the water will be adsorbed in the resin to achieve the purpose of purifying the water. With the increase of water treatment capacity, more and more impurities are adsorbed, and the adsorption capacity of the resin will gradually decrease. To remove the impurities (mainly calcium and magnesium ions) adsorbed by the resin, it is necessary to use sodium ions to remove them through ion exchange. The impurity ions adsorbed by the resin are replaced to restore the adsorption capacity of the ion exchange resin. This process is also called ion exchange resin regeneration.

The role of dish salt

Through the working principle of the water softener above, we can see that the role of adding dishwashing salt to the dishwasher is to regenerate the resin and allow the water softener to provide soft water again.

main ingredients in dish salt

Dishwashing salt is actually water softening salt, which is usually used more in various water softeners. Its main chemical composition is sodium chloride (NaCl), with a content of more than 99.5%.

Is Dishwashing Salt Harmful?

Some people worry about whether dishwashing salt is harmful to the human body. The main ingredient of the edible salt we usually use for cooking is sodium chloride. After so many years of eating it, there is nothing wrong with it, right? Therefore, the use of dishwashing salt is safe and sound, and you can use it with confidence.

what to substitute for dish salt

Seeing that the dishwashing salt above is sodium chloride, some people must be curious whether it is possible to use edible salt that we usually have more contact with and is particularly cheap to replace soft water salt. The answer is no, because our edible salt is iodized. Iodine has a strong penetrating power to the surface of resin particles. Long-term use of iodine salt will reduce the surface strength, hardness, mechanical strength, volume expansion strength and circular curvature of the resin, make the resin easy to break, and reduce the exchange capacity of the resin (referring to strong acid type resin). So iodine can only play a destructive role, and occasional use is not a big problem. Can’t use sea salt either, it’s too dirty.

If you really want to replace dishwashing salt, you can use chemically pure sodium chloride, but it is still recommended to use special salt for dishwashers. The dishwashing salt itself is not expensive. In the reply, alpha_boy suggested to use medium salt soft water salt instead of dishwashing salt. The solution is feasible and cheaper, but because the soft water salt of medium salt is lumpy, it takes more time to dissolve. In other words, if it is washing The medium-salt soft water salt added when the indicator light of insufficient salt in the bowl is on may not turn off the light immediately, and you need to wait for a few more days, especially if the temperature is too low in the recent period, the dissolution rate is slower.

Do I have to add dish salt?

In fact, it is not necessary to add dishwashing salt. It mainly depends on the local water quality. When the water hardness is lower than 125mg/L, it is not necessary to add dishwashing salt. This is also the reason why many people on the mobile01 forum said that adding edible salt to the dishwasher does not cause scaling, because the water quality of Ya is very soft and does not need to be softened at all, so it is okay to use edible salt for a long time (the actual exchange resin has already been destroyed) .

Do I need to add dishwashing salt when using dishwashing blocks?

Using dishwashing blocks (including washing gels, which are generally all-in-one) generally does not need to add dishwashing salt. However, if the local water quality is higher than 374mg/L (21°dH), you need to add dishwashing salt, which is already very high hardness, and remember to adjust the soft water level setting of the dishwasher according to the actual situation (according to the instructions) .56

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