Acetic acid is used in Finland in containers. Not in sea container as most 
beekeepers here could not fill a sea container with all of their boxes.

So they use insulated boxes with floor area around 4 - 10 m2. Bee boxes in, 
stacked in  pallets crossing each others to let the air better in.. Acetic 
sprayed in by plant sprayer ( the type you have in your back, with hand 
pump) or some place the acetic for evaporation on wide pans on top.

Almost all use heater that blows also to circulate the air.  This is done 
during fall/winter/ spring when outside temperatures are too low here for 
effective treatments. Aim is to have temperature between + 20 - + 30 C. 
Don't remember the scientific data of treatments times, but most beekeepers 
keep the frames in for 4 - 7 days and then change for another batch.

Styrofoam boxes are good in this, no nails rusting.

Frame wires should be stainless steel for not rusting in process.

Ari Seppälä

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