• Reduce activity of agricultural chemicals
• Block spray lines or nozzles, reducing chemical application uniformity
• Increase wear of nozzles also causing reduced chemical application uniformity
• Increase wear on spray rigs

Water quality is variable and is dependent on the source of the water (e.g. rainwater, farm dams, river, bore, town reservoir). Water quality can also vary throughout the year and after periods of high rainfall or drought.

Use the cleanest water possible when preparing agricultural chemicals for application. Where clean rain water is not available use the following guidelines to minimise spray failure due to poor quality water. Note that some agricultural chemicals are more sensitive than others to poor water quality; check the specific instructions on pesticide labels.