It's the first time I own a dryer.
When I poured out the water it has collected (a few liters per run) I quickly tested the EC and pH and found out, that it is almost identical to the one made by my reverse osmosis filter!
No wonder, since the dryer is basically just a big distillation machine.
Thats super neat. It will save me a lot of work filtering tap water.
I will collect it from now on and use it for watering my plants.
Why does it matter?
Plants really don't like tap water. Even in a country like mine, where no chlorine/ fluoride/ whatever is added, the dissolved minerals cause trouble. They will build up over time and make nutrients unavailable, even if you adjust the pH.
The buildup and nutrient lockout will harm the plants a lot in the long term, and you will have way more trouble checking and correcting EC and pH.
Comrade, it is not distilled water and neither is your RO.
Distilling separates fractions in the liquid by boiling point. That's why it's not just boiling a pot of water and catching all the steam. You need to have some sort of idea of what you are separating and ensure you are collecting the distillate at the correct temperature (based on the atmospheric pressure). RO is - in an extremely simplified description - a filter, where particles that are small/soluble enough will pass through the membrane if sufficient pressure is applied.
Distilled water will have zero conductivity, RO will have some.
As an aside because I am insufferable: your meter says TDS but it's measuring conductivity. They are often used interchangeably because TDS is a massive pain to test at home. If you are always measuring the same thing, it's fine to use conductivity as a surrogate, but you can't compare the conductivity of sugar water to salt water and assume you have a good idea of the TDS.
I won't venture to comment about its use on plants but to folks asking about drinking it in the comments, please don't. Even if it was distilled it's hanging out in an environment full of airborne life and wouldn't remain sterile for long.
(Credentials? I got a D in mass transfer 20 years ago but I still somehow manage to work as an engineer and do a lot of lab work too. But nothing I've said isn't readily verifiable)
Cs get degrees!
(I got 4 Ds in my academic career and I was grateful for each one lol 🥲)