Fertilizer solution must never be allowed to flow back through the faucet and into your domestic water supply.
To keep your domestic water safe, add an anti-syphon valve (V4) to the faucet before attaching the fertilizing system connector. That way, if there is a sudden loss of pressure in your domestic water supply, the water/fertilizer solution cannot syphon back through the faucet. Consult local bylaws for requirements.
If your drip irrigation system extends to ground that is higher than the faucet assembly, special precautions must be taken to prevent the backflow of irrigation water into your domestic water supply. Please consult a licensed plumber who can install a one-way valve that will keep your house water safe.
Loosen the blue and green nuts on the side of the cap but do not remove. Push the end of the clear tubing into the hole in the green nut and tighten the nut. Do the same with the black tubing into the blue nut. Install the other ends of the tubing to the white hose bib adapter shipped with your fertilizer unit - the black tubing to the blue fitting and the clear tubing to the green fitting.
Install the white hose bib adapter to the faucet assembly below any filter, pressure regulator or timer. The fertilizer unit hose bib adapter should be the last component in any configuration.
Cut each length of clear and black tubing supplied with your fertilizer unit about 12" from the tank and install one small black valve, included, in each length of tubing. Turn the valve handles so the arrow is lined up with the tubing to open.
If you have a multi-station AC valve controller and system, we have a special connector, the FER4, to add an automatic fertilizing system. It's made of schedule 40 PVC and equipped with 1" female pipe threads that fit directly into a multi-station manifold system. The adaptor must always be installed downstream of the AC valve so that the tank is not under constant pressure.
The tank must be located at a height within 12 inches vertical of the faucet connector. Use a stand if necessary.
Add about two inches of water to the tank. Add the prescribed amount of dry water-soluble fertilizer or liquid concentrate. Open the small valves that control the flow of water to and from the tank and turn on the water.
The tank will fill with water and fertilizer solution will start to flow. Control the rate of dilution with the dial on the tank cap. The fertilizer will flow until depleted. Then clean water will fill the tank.
When done fertilizing, shut the two small valves to isolate the tank from the drip system. Now you can remove the tank from the cap and refill with fertilizer.
Any amount of fertilizer can be used up to the prescribed maximum, so that you can use a small amount of fertilizer for a small area of garden.
A special connector is available with a built-in valve (FER12). Use this connector if your drip system is operating at a very low water volume, down to 3 gallons per hour. Or if your drip system is higher than the fertilizing unit in elevation.