I like to treat my hives with OAV at least once a month during winter when the temps hit the 40s and I see some activity. I use a Johnno's easy vap vaporizer. 15 hives took less than 30 minutes. Thank Instantvap Lite Oxalic Acid Vaporizer DeWalt Battery Compatible Oxalic Acid Vaporizer Treatment Caps 5 Pack for Lorob Bees Lorob Bees LLC SOLD FOR SALE Johno's Easy Vap $125 Its been a good one for me but I no longer need it due to upgrading to a cordless model. YOVO JB50000 Pod $12.89 PerfectVape Sour Apple YOVO JB50000 Kit