Why Your Sprayer Is Foaming and How to Stop It

Sprayer foaming causes usually trace back to agitation that is too aggressive, products that naturally foam, hard or soft water quirks, or loading order that whips air into the solution. Foam slows filling, messes with sight gauges, and can spill over.

Some foam is normal. Foam that overflows or refuses to settle is a process problem you can fix.

Reduce bypass agitation while filling when possible. Add products with the tank partly full and induction systems set to minimize air. Avoid dumping powders onto a dry tank bottom.

If foam persists, an antifoam adjuvant labeled for spray use can help. Use the rate on that product’s label—more is not always better.

Do not sacrifice required adjuvants just to stop foam. Fix the mechanical cause first, then use antifoam as needed. Clean foam residue from lids and platforms so it does not become a slip hazard at the next fill.

Roush Ag Solutions can help you review antifoam and adjuvant options for your spray program.