I find it very inconvenient that TineCo only comes with two filters as they get dirty very quickly and dry out within a day even in our heat . I was happy to see a reasonably priced two pack but after receiving them it became clear why they don't cost more. Outwardly, they're very similar to the originals, but they had some weird bumps and bumps, and it's all because they don't have plastic construction on the inside. Maybe I'm wrong and they will last as long as the original set but I'm not betting on them. I think they can be prone to breaking, tearing or breaking in any way. I wish the manufacturer had made it clear that they weren't up to par with the original filters.