For pollen I can not say much. Have just frantically trying to befestiegen the web using the supplied velcro. The velcro itself bonded bombproof the wooden frame of the window, but the fleece adhered as not so good on Velcro. After very thorough pressing it stopped then ... until the first light (!) Windstößchen. I have then made do with eight nails, now it keeps the time being anyway. The pollen may probably be good, but for the really poor attachment there can be no good evaluation.
