Packaging says there should be 4 filters per box. I have 3 filters. Update: Having received 3 filters in a box of 4, I wanted to clarify that this is a Tetra quality control issue and not a Revain quality control issue. Revain solves their problems perfectly. In the future I will be buying Tetra filters from Walmart or PetCo so I can open the box at checkout and make sure all 4 filters are in the box. FYIThanks
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