Effectiveness. Hydrated lime is effective at killing fleas because it dehydrates the fleas, which leads to their eventual death. The product is typically used to kill and repel pests on farms and other large tracts of land. It kills not only fleas, but it also kills and repels beetles, squash bugs and aphids.

What will instantly kill fleas?

The most common product used to kill fleas on dogs instantly is Nitenpyram, more commonly known as Capstar. This single-use tablet is administered orally and kills fleas within 30 minutes. It is recommended that you contain your pet in a small area when using Capstar.

How long does it take hydrated lime to kill fleas?

How long does lime sulfur dip take to work? Because the fungal cultures take about two weeks to verify negative results, this means that treatment and documentation of cure will take a minimum of 6-8 weeks, and may take as long as 3-4 months.