?> The lid change is because we only have one with the mesh that belong to 
the "varroa guy", the others are the clasical tin ones.

I guess that keeps him running so the bees don't suffocate, or does the CO2 
build-up pacify the bees -- to your advantage?

> We buy half a kilo powder sugar bags and have tested all the brands 
> available till we found the only one with no crumbs.

Ah ha!  There is the trick.  No wonder different people have differing 
success!

I imagine it would pay to classify different brands for particle size under 
a microscope.

There may be differing moisture levels, too, which could be easy to 
determine by weighing, drying, then weighing again.

The plot thickens...

As with everything to do with mites, the devil is in the details. 

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