Alternate wetting and drying will not reduce their effectiveness. 6 per package. Mosquito Dunks are useful in bird baths, flower pots,tree holes, rain barrels and roof gutters, unused swimming pools, old automobile tires, water gardens, etc. When it sees an intruder, it instantly releases full garden hose water pressure towards the trespasser. The effect is both startling and immediate.
Animals quickly get out of the area and avoid it in the future.
Uses 2-3 cups of water per deterrence. Runs for months and fires up to 5000 times on one 9 volt battery. Detects animals day and night. Sprays only over the area to be protected. Easy to install, move and store.