how do you know when the product is all used up? I sprayed for quite a long time and the bottle is still completely full, Im assuming its all water now. I can't tell if there's any product left or if the bottle is now all regular water.

Hi RMar, thank you for the inquiry regarding our Triazicide For Lawns and Landscapes 32.0 -fl oz Hose end sprayer. The container should be fully emptied out after 30-40 minutes. The side of the bottle has a clear window to indicate how much product is left inside. For further assistance or questions or comments you can please contact us at 1-800-332-5553 M-F 9am-7pm EST or email us at youropinioncounts@spectrumbrands.com so that we may better assist you. When contacting us back please refer to case number 2090650.