Turn your neighbors GREEN with envy by installing the ASAE - AE50 award-winning Add-It® or Fertilizer Caddy® fertilizer injector into your drip irrigation system! Enjoy a healthier more vibrant landscape and an abundant vegetable and flower garden.

Immediate Benefits!

Additional Benefits

Fertigation….the easy, economical and efficient way
to fertilize as you irrigate with a drip irrigation system!

Strong Injectors welcomes your interest in the patented, ASAE - AE50 award-winning,
Add-It® and Fertilizer Caddy® proportioning fertilizer injectors.

Now that you've installed a drip irrigation system to conserve water,
how are you going to fertilize your plants? We’ve got the perfect solution!

Thanks to people like you who understand the benefits of fertigation, since 1987, Strong Injectors has manufactured over 185,000 fertilizer injectors for people just like you. Add-It® is the most popular proportioning fertilizer injector of its type on the market today! The question remains, with the advent of drip irrigation, how do you fertilize your plant material? Amid the continuing concern over water shortages, many commercial growers, landscape contractors and homeowners are either initially installing, or converting to, drip irrigation. However, this change poses yet another dilemma. If utilizing a drip irrigation system in order to conserve water, as well as save time and money, no longer can you broadcast dry granular fertilizer onto the surface of the soil and expect it to be leached in by overhead watering, where the plants roots can pick-up the nutrients. Therefore, the fertilizer must be dispensed directly through the drip irrigation system. The concept of fertilizing through the irrigation system is known as fertigation.

Add-It® and Fertilizer Caddy® proportioning fertilizer injectors make fertilizing not only easy, but economical and efficient as well! The fertilizer being delivered through the drip irrigation system is at a constant rate from start to finish, unlike many other injectors on the market! They also accept any totally water-soluble fertilizer on the market today like Scotts Miracle-Gro® and Peters Professional®. In addition, a wetting agent can be dispensed to breakup compacted soils, compost tea to increase micro-organisms in the soil, micro-nutrients and Vitamin Institute’s SUPERthrive™ containing vitamins and hormones for more vigorous, healthier plants, and vitamin B-1 when transplanting trees and shrubs.

Add-It® and Fertilizer Caddy® fertilizer injectors can be installed before a manifold of valves under full line constant pressure up to 80 PSI, or can be installed after a single control valve. The Fertilizer Caddy® can be either permanently installed or used as a portable unit and moved throughout the yard and used as a foliar feeder, when equipped with hose threads, making them even more versatile!

Works equally well when installed in a conventional sprinkler irrigation system!

  Awards and Recognition

Add-It ® 

Available vertically in a pint, 1½ quart, ½, 1 and 2 gallon capacities, and horizontally in 3 and 5 gallon capacities. They are available with ½”, ¾”, 1”, 1½”, and 2” FPT inlet and outlet. Many models are available with hose threads.

Strong Injectors™ has received recognition four times from the American Society of Agricultural Engineers, receiving the AE50 award for outstanding innovation in product design.

The Add-It® fertilizer injector has also been featured in Sunset magazine, seen on HGTV’s - Gardening by the Yard, are member tested and recommended by the National Home Gardening Club, and are used extensively by UC Davis Department of Plant Science!

The terms injector and dispenser are synonymous.

Product Details

Add-It ®



Fertilizer Caddy ®

Available in ½,1, 2, 3 and 5 gallon capacities. Available with ½”, ¾”, 1”, 1½”, and 2” FPT inlet and outlet, or with hose threads.

The inlet and outlet manifold can be installed either vertically or horizontally, making it extremely easy to install.

Install permanently or move about the yard when equipped with hose threads, making it even more versatile. 

Product Details

Add-It ® 
pint capacity

Portable proportioning fertilizer injector and foliage feeder as featured on HGTV's Gardening by the Yard.

Pint capacity with ¾” female x male hose threads. Available with or without a plastic vacuum breaker anti-siphon valve.

Attaches easily to a hose bib or garden valve. Ideal for use with hose-end sprinkler/spray and Porous Pipe! You can use your favorite totally water-soluble granular fertilizer when premixed with water.

Product Details