Cleaning the tank and spray system — the step you skip and pay for later

Cleaning the system after spraying is the job skipped most often, because you are tired and want to go home. Yet it is the job that prevents the most damage for the time it takes.

Why clean every time

Residue in the tank, hoses and nozzles may react with the substance used next time.
Herbicide residue, even in small amounts, may seriously damage the crop in the next field, especially when the two fields grow different crops.
Substances that dry inside the system block nozzles and make the pump work harder.

Basic steps

Drain all the remaining spray mixture in a suitable place. Do not pour it into water sources or drains.
Fill with clean water and run the system so water flows through the hoses and nozzles until it comes out clear.
Remove the filters and nozzles and wash them separately, because that is where most sediment builds up.
Repeat at least twice when changing substances, especially when switching from a herbicide to another type of product.

Some substances have specific cleaning instructions on the label, such as a particular cleaning agent to use. Follow them.

Where does the rinse water go?

Not into canals, ponds or waterways. The usual method is to spray the rinse water out over the field you have just sprayed, an area that has already received that substance, rather than collecting it in one spot.

Storing it for several days unused

Clean it and let the system dry completely before storing. Water left in the hoses causes sediment and odour, and in some cases makes parts wear out faster.

What to check while cleaning

Look for leaks at the joints, torn filters, and nozzles worn so the opening is abnormally wide. Cleaning is the best moment to check these things, because you are handling every part anyway.
Important note
This article explains general principles. It is not a recommendation for any specific chemical. Suitable mixing rates and timing differ by substance, crop, growth stage and field conditions. Always treat the product label as the authority, and ask our staff or an agricultural specialist before deciding.