I bought this product to deal with a very bad spider mite infection on my pansy flower bed. I had thousands of mites making almost all my plants unable to develop and was very close to losing them all. The order arrived very fast and I released the phytoseiulus over my plants immediately, and oh boy, then went to work! A few days later (about a week), all the spider mites were gone! Adults, eggs, everything! Their webs were still around, but gone after a few rainy days! I could not be happier with the product! It has been over 8 months since I purchased and the spider mites have not come back! Definitely recommend buying!