Filter Paper 24cm Lab Qualitative Filter Paper for Chemistry, Standard Qualitative Grade 4-Fast Flow 240mm(100 Discs)

These papers are well-made and not floppy or crammed in a too-small box. They are NOT fast papers. My primary filtration went from about 30 minutes to over 2 hours (8 liters). I'd have to say these fall in the range of medium to slow, not fast

I guess I ordered the wrong one. I need something more porous.

fast service and the filter fits my vac.

I didn't expect much when I bought these cheap filters but was surprised to find they were firm and performed as advertised, unlike a lot of Chinese rebrands. Good value for the money. I'll definitely buy again.

Works great! Holds up well, and you know, filters stuff.

Perfect

Good quality.

exact fit for what i ordered, good filtration flow rate. would order again