SIPHOTROL PLUS Fogger kills adult fleas, hatching flea eggs, and ticks. Precor, the ingredient in the SIPHOTROL PLUS Fogger, provides 30 weeks protection by preventing eggs from ever developing into biting fleas. This product enables you to fill an entire room with insect-killing fog while you are away. For best results, use SIPHOTROL PLUS Fogger together with other Vet-Kem products for complete control of fleas and ticks. Kills adult fleas and ticks. Stops hatching eggs and larvae from developing into adult fleas for 30 weeks. Prevents flea infestation and flea build-up for 30 weeks. Treats 6,000 cubic feet.