Descaling for home appliances?

 Also, what are the consequences if we don't descale - the iron, airpot works fine. 

For Nespresso, I read that they will take longer to heat or water will be cold, coffee will be bitter. 

They still heat up. 

How do I know if the 1) to 3 items need descaling?  

Thanks again. 

 

Thank you Mr Chen Ko for your thorough water blog. 

 

Hope you can advise me if the following needs regular descaling if used in Singapore with its soft water:

1) Iron with water container, 

2) Thermal air pot or  kettle 

3) Nesppresso?

 

So far we have not descale any of our electric water containers. 

At most, I  see the ageing water heating rod turned orange in our kettle.  

Thank you for your kind sharing. 

 

kim

 

Dear Kim

Here are a few thoughts regarding the issue.

1. Hardness in water is due mainly to calcium and magnesium initially dissolved in water. Due to heating, these calcium & magnesium react chemically with other substances in water to form your solid scale.
   
   
2. Toxicity of scale is not an issue so we can leave that out of the equation.
   
   
3. However, scale does adversely affect heat transfer in heating equipment so a thick layer of scale means that you need more power to heat up the same amount of water or beverage. In industry, it is a standard practice to descale large-scale heating equipment to minimise heating costs. For domestic purposes though, I hardly hear of such a practice as the economics probably do not work out favourably. Your equipment probably fails before the scaling becomes problematic.
   
   
4. As you rightly pointed out, the water in SG tap water is soft so the scaling problem is somewhat less severe than in other countries consuming hard water in their homes.
   
   
5. Though scale is somewhat stable normally, it can break up and dissolve in an acidic environment. Incidentally this is one way to perform descaling. You mention about coffee so yes, if your coffee has the right level of acidity (this applies to tea too), the scale can dissolve into your beverage and most likely affect its taste.
   
   
6. Long story short, if you believe the scale is affecting the taste of your normally superb coffee/tea, go ahead with descaling. However, I am unsure of the economics of such a move compared to simply getting a new machine.
   

Good luck!

Figure: Nespresso machine