Effortlessly Boost Your Garden Growth with the Fertilizer Injector Automatic Water-Powered Chemical 77946762Hydraulic fertilizer spreader, no electricity required. It uses volume ratios to ensure that the chemical mixture remains the same regardless of changes in pressure and flow. Water flow is reduced when passing through the fertilizer injector. Using reciprocating dynamic sealing technology, the metering pump has higher precision. The unique design of the cylinder and piston movement area ensures more uniform and effective mixing of the liquid medicine.