Thanks for your contact. We are so happy to hear from you.
At Okaysou, we hope you can get better quality air and healthy balance life, so we have adopted three filters of medical grade. The Most Powerful and Efficient air purifier with Auto/ECO mode (10L Pro won’t use a cheap single filter like other air purifiers).
Considering your kind question, our okaysou airmax8L Ultra-Filter is $19.95 and the airmax8L Duo-Filter is $18.95. Not our 10L pro filters.
You are our valued customer, you definitely can choose okaysou purifiers according to your own needs. Please no worry, we are always here for you.
Have a nice day!