Another thing that kills fleas on all surfaces, even sand fleas, is a spray bottle of alcohol.
I will let my director know what you suggested. If she and the board members agree to the investment of both items (DE and Dehumidifiers) I will be sure to let you know the results!
Yes, my master! Here is the tiny ad you asked for:
177 hours of video: the 2017 Permaculture Design Course and Appropriate Technology Coursehttps://permies.com/wiki/65386/hours-video-Permaculture-Design-Technology