The 4 different types of filters I use
- Cotton makeup removers or cotton balls. These are great for cone funnels. The catch everything. Just push them in.
- Coffee Filters have a pour size of around 20 u (microns).
- Paper filters. These have a pour size 10 u and up.
- Filber Glass filters have pour size of about 0.2 u to about 2.0 u.
The problem with all cotton or paper filters are they don't handle acid well. Filber glass filters are made out of ... Glass. If you can use a glass beaker, you can use a glass filter. They even make borosilicate filters. Example. Amazon. Omicron 133047 borosilicate.
With bushner filters once the filter is in place, spray it with water to make the filter stick.
If you want to create a cup, like a coffee filter, use a 150 mm filter, push it in dry, make sure there are no gaps. Then spray it with water and re-inspect.
The are 2 main types of filters: Quantitative and Qualitative. The quantitative are flow faster flows as compared with other filters of the same type.