use above link to check.

otherwise you got to try your luck to wait for someone who has the same problem as you for recommendation

ya, not so efficient. even my ionizer 1 also same. sucking dust seems not the main function for the air filter.

What task that you wish the air filter can deliver?
If to increase humidity in an aircond room, no need spend any cent. Just place a bucket of water in the centre will do.

If your centre is easily get dusty every day, then my advice would be to get a cleaner to regularly vacuum and clean the area.
You don't need air purifier already.

For air purifier, 2 main criteria you need to consider.
1. CADR, clean air delivery rate. It determine how effective in providing clean air in a period of time.
2. The HEPA, micron size. The size of the gap that the viruses and bacteria that will be trap here. The smaller size the better because those harmful ones has really small size in micron. You can check in google.

My 2 cents. Hope it helps.
https://learn.allergyandair.com/hepa-filters/

Go look for Atmosphere Sky.
Highly recommended by doctors, pediatrician and widely use in hospital now.

Get review from users who are using it.