Api-Bioxal is a licensed oxalic based product. It can be distributed via two methods: trickling and vaporising.
 
Packs come in 35g, 175g, 350g, enough to treat 10, 50 and 100 hives respectively if trickling.
 
Do not treat hives when supers are on if you are taking the honey off for human consumption as oxalic acid ages honey, so cannot be sold commercially.
4.2% solution. 
 
Simply dissolve in syrup and trickle 5ml on to seams of bees between frames. 
Method 1: Trickling (Dribbling)
Preparation: Mix 35g sachet of Api-Bioxal powder into 500ml of warm, 1:1 sugar syrup (approx. 308g sugar + 308ml water) until dissolved.
Application: Open hive, identify bee seams (spaces between frames with bees). Use a syringe or trickle bottle to apply 5ml of solution per seam, running it down the bees.
Dosage: Max 50ml per hive. Treat all hives in an apiary at once.
Timing: Best in winter when there's no brood (no wax caps). 
Method 2: Vaporization (Sublimation)
Preparation: Measure 2g (or 2.3g depending on source) of Api-Bioxal powder.
Application: Place powder in a vaporizer (e.g., Varrox, Sublimox). Insert device into hive entrance, seal it, and vaporize per manufacturer's instructions (approx. 3 mins).
Post-Treatment: Keep hive sealed for another 10-15 mins. Clean vaporizer after use.
Timing: Once per year, with full protection. 
Also suitable for use in vaporisers.
35g sachet treats 10 hives
175g sachet treats 50 hives
350g sachet treats 100 hives
Wear suitable safety equipment.