Sorry for the possibly wrong terminology. I'm not a chemist and I'm not a native English speaker.
Please edit the question as needed. Thank you.
Is it possible to buy or prepare a dispersion with the following properties?
- the particles should be >0.1μm in size, for example 0.11μm - 0.2μm
- there must be a way to detect them - even in a small amount (colour, taste, chemical reaction with something else, ...)
- it mustn't be a "glue"; it must be possible to flush them completely away with water or something else readily available
- it mustn't be a toxic or corrosive substance
- the dispersion (or components to prepare it) should be readily available (drugstore, grocery etc.)
- the total price shouldn't be higher than $20 (I know this difficult with prices different in every country - this is just a guideline)
Why do I need it?
There's a very slight chance that a Sawyer Micro Squeeze Water Filter might have been exposed to a below zero temperature and might have been damaged by frozen residual water.
The manufacturer says there's no way to test the filter functionality in that case and a new filter should be bought instead. I wonder if this is really needed or there's a way to test the filter at home.