Mazzei Flow Chart (Venturi style) Mazzei Unit Replacement springs and balls can be purchased if necessary and are included in the Mazzei rebuild kits.

If taking apart the Mazzei injector for cleaning, be careful not to lose the spring or ball inside the injector.You will need to experiment to get the dosages required, but once operating, the Mazzei is incredibly reliable and relatively maintenance free. In order for the Mazzei to work properly there has to be a 25% pressure differential between the incoming pressure and the out going pressure, this will make the vacuum effect to draw fetilizer. This allows you to adjust the Mazzei's flow with less restriction. If in doubt always choose a smaller size and install on a bypass assembly. An oversized injector will not draw the fertilizer at all an undersized injector will restrict the flow of the system. Select the injector that matches the flow rate (GPH) that your irrigation system uses.

It is important to choose the model size carefully based on the water usage of the irrigation system. The Mazzei can be plumbed on a bypass for less restriction (the preferred method), or directly into a main water line. They work by suction, and can draw liquid fertilizer from virtually any container. Mazzei fertilizer injectors are commercial-grade, Venturi injectors with no moving parts to wear out or break down.

Liquid fertilizers and injection