SentinelAeon

I hope someone can shed some light on that dust in the meanwhile, i guess it cant be smaller than HEPA, but getting air through HEPA with small PC fans is very hard. Btw, you seemed almost surprised at the use of calcium chloride, i just wanna double check that i didnt mess up the name terribly somehow ? But in shops i often see those little boxes, inside the box at the top is compartment for tablets and i assumed that was calcium chloride, and then as the air passes through this tablet, as it liquifies, it will drain to the bottom of the box. I even saw some variants with a fan but that is where i found some clear warnings that fan and calcium chloride is not a good combination because of the dust. And that is what got me into wanting to know the size of it to see if filtering it could be a solution.

It seems to be quite cheap so it shouldn't be to much of a problem to replace it. I wanted to include a collector bin under it to collect water and i can just dispose of the water/solution when it is full. Bin can be like 10L or 20L.

I like doing simple home gadgets for fun and to learn something new. I am trying to do a simple DIY room dehumidifier consisting of calcium chloride, a fan blowing over it and water collecting cup. But i also found some health concerns regarding calcium chloride - namely using it at home and blowing into it, the dust is supposed to not be to good for lungs. Since i do not know much about chemistry i have 2 questions that i hope you can help me with: 1) I am thinking whether it would be possible to cover the fan exhaust with some kind of filter to prevent this dust to enter the room air. But i need to know how small this dust is to know the MERV value of filter i need to choose 2) Is there maybe some cheap safer alternative i could use ? Rock salt ?