Have about a 1/3 of the bottle left over from last year but this year, no solution is coming to mix with the water. Is bottle no good after 1 use?

I too had this problem, the solution crystallized and inhibited the mixture rate. I strained the solution through a rag and all seemed fine.

Hi Mike, thank you for providing your feedback regarding our Immunox Fungus plus Insect 1-fl oz Concentrate Lawn Insect Control Hose End Sprayer. The product does not expire unless the bottle is leaking or damaged. We're sorry to hear that the product didn't provide the expected results. The satisfaction of our consumers is very important to us. Please contact us at 1-800-917-5438 or email us at youropinioncounts@spectrumbrands.com so that we may better assist you. When contacting us back please refer to case number 1841977.