What carrier do you use for shipping? Boostopia August 21, 2019 17:35 Updated Follow Second Nature (formerly FilterEasy) uses FedEx SmartPost. If you have any special restrictions on delivery of packages, contact us for help. Related articles How can I track my shipment? How do I contact Second Nature? Why was I sent a 5" filter when I ordered a 4"? Realtor® Closing Gift Partnerships I need some filters more often than others. How do I adjust delivery? Comments 0 comments Article is closed for comments.