Is there a daily purchase limit for BUFF® Filter Mask or BUFF® Filter Tube? October 10, 2021 14:01 Updated No, there is no purchase limit. You can buy as many BUFF® masks as you want for you and your family. Related articles Can I use the BUFF® Filter Tube without a filter? How long will it take to receive my BUFF® Mask once I have purchased it? How many filters are included in the BUFF® Filter Tube? Can I wash my BUFF® Filter Mask or BUFF® Filter Tube at 60ºC?