http://cnnphilippines.com/metro/2015/05/12/EcoWaste-Coalition-wants-oxalic-acid-banned-in-Manila.html Oxalic Acid can be found at market...
If used correctly Oxalic Acid is the best treatment for the aggressive Philippines Varroa mite. BUT, it must be used correctly as it is dangerous for humans. Do not be fooled into thinking that it is safe because it is natural. Tigers are natural. Volcanoes too. Oxalic acid is dangerous for you but safe for the hive and will not harm the honey. Bee very careful. You have been warned.