According to my experience on my colonies, this bottom board eliminates any need for chemical treatment. The varroa mites are not fully eliminated, but they remain in such a small number that they are no longer harmful. In the worst case, only one treatment per year might have to be done, which is enough to economically justify it. In winter, waste as well as condensed water are automatically eliminated, which avoids production on the board of bacteria and fungus, potentially a source of diseases. Bottom board cleaning chores in spring are also eliminated.
Ventilation is gentle and evenly distributed.
The transparent tubes let in the daylight, which is said to make bees milder. The front tube bearing strip can be separately taken out to easily fit and remove the set of tubes. Particular attention must be given to hole positioning. Nominal gap between tubes is 3.6 mm. Beyond 4.2 mm, bees can go through, which should be avoided.