09-03-2014, 02:20 AM
Mosquito dunks should never be used in drinking water. Read the label. Also, putting some bleach in the catchment will not control mosquitoes. Unless you bring the chlorine level up high like in a swimming pool, the little buggers just won't care. Out of frustration, I once poured a whole bottle of bleach into a half full catchment full of mosquitoes and nothing!