Truly an excellent company, with a very generous return policy (see my additional comment).
About the product:
I did not intend to use the intense filtration dust bags that I had purchased from DustDeal and I explained the reason to their representatives. I thought of returning the bags and getting some money back, but they made me a much better offer: keep the bags, recycle them if you decide never to use them, and we'll issue you a full refund. And that is exactly what happened!