Why should wash sprayer

Before professional backpack sprayer of pesticides can not or should not mix the two, you must clean the sprayer, otherwise, not only will reduce the efficacy and prone to injury, resulting in undue loss. The specific cleaning method is:
1, plastic bucket sprayer
5% of the first pour hot lye (water temperature above 60 ℃), so full of all parts of the lance, nozzles, etc., shaking once every 10 minutes, after 2 to 3 hours, pour the lye, then water rinse 2-4 times.
2, drum sprayer
First pour 1% black alum water (ie, ferrous sulfate solution) to soak 2 hours, then rinse 2-4 times; may also be soaked with hot alkaline (as above) for 1 hour, then hot alkaline wash again, and finally rinse with water 4 to 5 times.
In addition, the spraying of herbicides used in electric sprayer, general cleaning ineffective, will bring chronic injury to crops, growth and even the final crop yield. So you want to set up a dedicated spray herbicide sprayer.