Unlike other Harris Spray Bottles, these have a chemically resistant sprayer in addition to a chemically resistant bottle. It's made to withstand harsh chemicals better than any other sprayer in our line. To use, fill the bottle to the desired fullness and ensure the cap is screwed on tightly. The bottles are resistant to leaking, but it's best to avoid leaving them on their sides when not in use. When spraying, twist the nozzle to reach the desired stream width. Because the bottle has a self-priming spray mechanism, you should only have to prime the sprayer the first time it's filled. After that, it will spray on the first trigger pull every time.