The disadvantage of the pump-it injector is that emptying the tank can require several pressurizations, the number of pumping strokes depending on the pressure differential between the tank and the system, the volume of concentrate in the tank and the desired rate of injection.

Don't try to force all of the concentrate into the system rapidly; rather, attempt to inject fertilizer at a uniform rate over a 30-minute period. While operating the injector, take time to inspect your garden, catch up on a few chores, visit with your next door neighbor, or perhaps meditate on the meaning of life. After each use, be sure to rinse the tank thoroughly, fill it with clean water and flush the hose and manifold.

At the Noble Foundation, we have used the brass siphon, Grow Pro, EZ FLO and our homemade pump-it injector successfully. Regardless of the model you select for your system, the injector must be installed below (downstream of) the head assembly vacuum breaker or check valve and ahead (or upstream) of the filter.

When using an injector, always wait until the system is fully charged before injecting fertilizer. When finished fertigating, run the system for a few more minutes to flush any remaining fertilizer out of the system.