A year later, I found not pop-up unit has not the cellulose inside but filled with lot of dirt. Would someone let me know about it? Thanks,

Hi Matt, thank you for the inquiry regarding our Spectracide Terminate Termite Detection and Killing Stakes. The baits can fill up with the dirt after the bait has been eaten by insects. The baits can be filled with dirt if placed in muddy areas. The baits should be replaced once a year. Please keep in mind this not recommended as sole protection against termites, and for active infestations, get a professional inspection. The satisfaction of our consumers is very important to us. Please contact us at 1-800-917-5438 or email us at youropinioncounts@spectrumbrands.com so that we may better assist you. When contacting us back please refer to case number 1931587.