I decided to mix up a batch of slow release Oxalic Acid. This requires a lot more OA than other methods, plus you need glycerine, which I found hard to get in volume. After a fair bit of research I found Alphachem in Mississauga who carry OA in bags up to 25 kg and Glycerine/Glycerol in 20 liter pails. The OA works out to < $8/kg and the glycerine < $20 per liter. These prices are much better than my bee keeping supply places, and they have stock. Apparently if keep dry and cool these can be stored for a very long time.
They also ship but I am local so I will go and pick up.
It seems to help if you mention you are a beekeeper (I ended up with better pricing)
They also ship but I am local so I will go and pick up.
It seems to help if you mention you are a beekeeper (I ended up with better pricing)