A galvanized tank is subject to rust and corrosion. It is suitable for most pesticides, but do not use with the more corrosive liquid fertilizers, insecticides, and nematicide. Protective coating does not prevent rusting from these chemicals. Corrosion and rust plug strainers, screens, and nozzles, and cause excessive wear and damage on pumps. Stainless steel tanks resist corrosion by any crop chemical.
Stainless steel is the most durable and long-lasting of all materials and it is expensive.
A high annual use may justify initial cost. A few pesticides, which usually carry a warning label, can also corrode aluminum. Polyethylene tanks are relatively inexpensive and available in many shapes and sizes. They are noncorrodible and compatible with most liquid fertilizers. Some ammonium phosphate solutions or complete-analysis fertilizers may damage polyethylene tanks.