I intentionally used [X-PEL] on our worst case scenarios. I felt that if it was going to prove itself as a product it had to do it at that level. We have found it to be very effective when dealing with nymphs and that is extremely important to the overall treatment process. We especially like to suggest this product to any family that has a large nymph population. Keep up the good work – The product is great and in the end its reputation will speak for itself.