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Internet # 306079989

Model # 4701

Store SO SKU #1003371192

HydroFeed 24 oz. In-Line Auto-Mix Fertilizer Injector System for Lawn and Garden Applications

$84.99
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  • HydroFeed works differently than a standard hose-end sprayer
  • A standard hose-end sprayer pulls the chemical up and out
  • Hydrofeed adds water back as your chemical is being pulled out
  • View More Details

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Product Details

About This Product

The Chapin HydroFeed fertilizer injector is a patent-pending design filled with features for use with sprinklers and direct hose spray applications. Great way to conserve water and still have a lush, green, well-fed landscape or garden. Different than a Hose-end Sprayer. HydroFeed works differently than a standard hose-end sprayer. A standard hose-end sprayer pulls the chemical up and out, emptying the tank. HydroFeed adds water back into the tank as your chemical is being pulled out. Because your chemical has a higher density than water, it sits on the bottom of the tank. Our outlet tube reaches the bottom of the tank so when clean water is being added to the tank, it stays on top of your chemical mix. You don't have to worry about your chemical being diluted as it's being fed through the outlet tube. This is why the tank turns clear after your chemical runs out.

Highlights

  • 24-ounce clear tank
  • Funnel-shaped head for easy filling and monitoring usage
  • Ideal for liquid fertilizer
  • Adjustable connection elbow lets tank mount to any hose spigot
  • Large opening with O-ring for leak-free operation
  • Rigid inlet tube with filter for debris-free mixing
  • Drain plug with valve to quickly empty the tank after each use
  • Not compatible with drip irrigation systems
  • Built-in mounting bracket
  • Return Policy
  • California residents
     see Prop 65 WARNINGS

Product Information

Internet # 306079989

Model # 4701

Store SO SKU #1003371192

Additional Resources

Shop All Chapin

Specifications

Product Width (in.): 4.75 in

Dimensions

Product Width (in.)

4.75 in

Details

Compatible Grass Type

All Purpose

Features

Water Soluble

Fertilizer Formula

Other

Liquid Fertilizer Type

Liquid Plant Fertilizer

N-P-K Ratio

0-0-0

Organic

Synthetic

Pack Size

1

Plant Name

Woody Ornamentals

Plant Type

Flower

Returnable

90-Day

Season Use

Fall, Spring, Summer

Volume (oz.)

24

Warranty / Certifications

Manufacturer Warranty

1-Year Limited

Questions & Answers

will it work laying on it's side
ByMay 19, 2026
1 Answer | 
Answer This Question

Model 4702 Hydro feed Injector will work in vertical position to work properly. If you have any further questions, you can reach out to 1800-444-3140 option 1 for technical support as they can assist with troubleshooting. Thank you.

By|Jun 1, 2026


    how to keep it vertical so a hose can be attached to bottom
    ByMay 19, 2026
    1 Answer | 
    Answer This Question

    Hi, for model 4702 32oz. Fertilizer Injector, the hose will connect to top inlet location. The lower port will be for draining. If you have any further questions, you can reach out to 1800-444-3140 option 1 for technical support as they can assist with troubleshooting. Thank you.

    By|Jun 1, 2026


      Can this work with a root irrigator spike driven into the ground or would the flow rate be insufficient?
      ByJun 11, 2025
      1 Answer | 
      Answer This Question

      Hi for product specification you can contact Product Support Team at 1800-444-3140 option 1 as they can assist with troubleshooting and warranty. Thank you

      By|Jun 12, 2025


        Must concentrated liquid fertilizer be mixed to recommended dilution level before added to hydrofeed or can concentrated liquid fertilizer be added directly into the hydrofeed
        ByMay 28, 2025
        1 Answer | 
        Answer This Question

        Hi, to best assist you, please reach out to our Product Support team at 1800-444-31400 option 1 as they can assist with specifications and troubleshooting. Thank you.

        By|May 29, 2025


          Can this injector be used to fertilize trees? Sorry if this question has already been asked.
          ByAug 3, 2024
          1 Answer | 
          Answer This Question

          Yes, the product description mentions it can be used for "liquid or granular concentrates and/or fish emulsion applications" which can be used for trees. The product information also lists "Woody Ornamentals" under Plant Name.

          By|Jan 31, 2025


          Does this have a bypass valve so I can use the hose for other applications without emptying the fertilizer chamber?
          ByJul 31, 2024
          1 Answer | 
          Answer This Question

          Hi John, the 4701 does not include a bypass valve. If we can help with any further questions, please call our Product Support team at 1-800-444-3140, option 1. Thank you for your question.

          By|Aug 12, 2024


            Does this system have a back flow valve to protect drinking water?
            ByJul 15, 2024
            1 Answer | 
            Answer This Question

            You should have a backflow prevention valve already installed at all hose bib connections prior to any hose or this device. If not they are easy to purchase and install in-line.

            By|Aug 1, 2024


              When used with an in ground system what is the drop in PSI?
              ByJul 3, 2024
              1 Answer | 
              Answer This Question

              Hi, To best assist you with your question on the 4702, please call our Product Support team at 1-800-444-3140 option 1. This unit is designed to be used with direct hose or inline with a sprinkler. Thank you for your question.

              By|Jul 10, 2024


                Viewing 1-8 of 39

                Customer Reviews

                4 out of 5

                • 4 out of 121 reviews
                • 86% recommend this product
                Filter by:
                Showing 1-10 of 121 reviews
                Yes you can intall on a drip irrigation. Works GREAT!
                Ive used this fertilizer injector to water my garden with a wand. To get the correct water pressure to make this injector work i bought an adjustable pressure gage and set it at 60 psi. (Update, I learned the precise psi os 40 psi with maximum working level of 60 psi and damage over 60 psi) We'll, I decided to install an irrigation system on my garden that is 20 psi. No problem I installed te injector at the source at 60 psi. The 20 psi pressure gage is installed at the garden. The injector got its 60 psi and the drip system got its 20 psi. Worked like a charm.
                by
                  • Recommended
                  UPDATE WITH A PHOTO
                  this happened on my second use, still brand new. disappointed returning today.
                  by
                  Response from Chapin International SupportJun 5, 2024
                  Hi ReyG, please reach out to our tech team and reference this review. Thank you. 1-800-444-3140 option 1. ChapinInternational
                    Bad female inlet connector
                    Bought on June 6th 2022, installed June 13 2022. Here it is July 24th and the female inlet coupler has popped off of the body.
                    by
                    Response from Chapin International SupportJul 26, 2022
                    Hi. Our goal is to have satisfied customers. Please give our Product Support team a call at 1-800-444-3140, option 1, and reference this review for your Chapin 4701: “HydroFeed 24 oz. In-Line Auto-Mix Fertilizer Injector System for Lawn and Garden Applications” and we can help get this issue resolved. Thank you for your honest feedback. ChapinInternational
                      Works well helps deliver fertilizer would suggest hd start to...
                      Works well helps deliver fertilizer would suggest hd start to carry Docs Super Juice by Andreson my lawn looks amazing! https://www.howtowithdoc.com/
                      by
                      • Verified Purchase
                      This HYDROFEED 16 OZ. IN-LINE AUTO-MIX FERTILIZER INJECTOR SYSTEM FOR LAWN AND GARDEN APPLICATION...
                      This HYDROFEED 16 OZ. IN-LINE AUTO-MIX FERTILIZER INJECTOR SYSTEM FOR LAWN AND GARDEN APPLICATIONS arrived quickly, well packaged completely assembled. This product was selected for an off-label but similar application as a soap induction unit for a preliminary washdown area in my shop. It is installed down stream of a siphon braking fitting and upstream from the supply line to my pressure washer. I haven't calculated the actual mix ratio for the soap cycle, but find that I've got at least 12 minutes of high pressure soap mixture before it turns into to a rinse cycle for cleaning projects.
                      by
                      • Recommended
                      4 found this review helpful
                      Chapin HydroFeed 16 oz. In-Line Auto-Mix Fertilizer Injector System for Lawn and Garden. Easy to ...
                      Chapin HydroFeed 16 oz. In-Line Auto-Mix Fertilizer Injector System for Lawn and Garden. Easy to install and use, this auto-mix fertilizer injector can be used in your garden as well as when you water your lawn. It can use both granular as well as liquid fertilizers. Has a convenient built-in drain so its easy to winterize it with a simple flip of a knob. The clear tank makes it easy to monitor how much fertilizer you have left while you are using it. For me, its one of the easiest ways to fertilize my lawn and garden. Highly recommended.
                      by
                      • Recommended
                      3 found this review helpful
                      Big Time and Work Saver If you want to make fertilizer applications easy and quick this is the it...
                      Big Time and Work Saver If you want to make fertilizer applications easy and quick this is the item to consider. What's in the box: 1 - Fertilizer Injector Head and Clear Canister With Drain Valve 1- 90 degree hose bib connector 1 - Instruction sheet First thing to consider before using this unit is the need for a back-flow preventer valve. This will protect your homes water supply and prevent the possibility of fertilizer and water mixture being pushed back into your domestic water system by loss of water pressure. The injector is easy to fill and easy to clean. The injector has a tall red cap on top; this is the fill port to add fertilizer. I find it much easier to remove the clear canister and fill that then screw the canister back on the fertilizer injection head. This is much easier to fill for me (your mileage may vary). This injector does not have an adjustable flow rate for fertilizer. You must dilute your fertilizer as directed by the fertilizer manufacturer. Once that’s done, the injector does all the work for you. This fertilizer injector saves a huge amount of work when feeding you lawn and other plants in your landscaping. No more walking behind a spreader or trying to feed by hand, now you can water like normal and let this injector do the work. This injector can use either liquid or dry granular fertilizers. Dry fertilizers should be dissolved in water before putting it into the injector. This fertilizer injector is a huge time and work saver. I would recommend that the clear injector canister be placed in the shade to reduce the chance of sun damage. The injector must also be removed if freezing temperatures are possible.
                      by
                      • Recommended
                      2 found this review helpful
                      The moment I heard about the "HydroFeed 16 oz. In-Line Auto-Mix Fertilizer Injector System for Lawn and Garden Applications", I decided to order one for myself. It is perfect for my front and back yards. No more carrying watering cans back and forth to fertilize my palms, bushes, and fruit trees with liquid and or granule fertilizers. Very easy to fill and clean. It can clearly be seen, when more fertilizer has to be added to the injector. I liked and I recommend it. For more information please refer to: https://www.homedepot.com/p/Chapin-HydroFeed-16-oz-In-Line-Auto-Mix-Fertilizer-Injector-System-for-Lawn-and-Garden-Applications-4700/305980208
                      by
                      • Recommended
                      1 found this review helpful
                      This IN-LINE AUTO-MIX FERTILIZER INJECTOR SYSTEM is a nice design. It is a bit hard to hook up t...
                      This IN-LINE AUTO-MIX FERTILIZER INJECTOR SYSTEM is a nice design. It is a bit hard to hook up to a water spigot that is close to the ground like mine are. I had to hook it up onto my hose reel where the hose hooks up to. You can use either liquid or water soluble fertilizer in this unit. To fill with liquid you just unscrew the red plug and fill. To use granules, you unscrew the canister from the bottom and fill. Replace the canister and you are ready to fertilize. The granules worked great for me. I even had to clean out some unused granules when I was done.
                      by
                      • Recommended
                      1 found this review helpful
                      This 16 oz HydroFeed fertilizer injector will be used with the new raised strawberry bed along wi...
                      This 16 oz HydroFeed fertilizer injector will be used with the new raised strawberry bed along with a couple of dedicated tree watering systems. And possibly for the squash bed. It is shown being used at the strawberry bed. It would be nice if it had some mounting provisions. I will probably rig something up and put a manifold not too far from where it is shown and plumb it in so it can be used with any of the aforementioned irrigation systems. I will probably plumb it with quick connectors so it will be easy to move and not have to stay exposed to sunlight other than when it is being used. I have another 8 oz injector that is used with the garden drip system. It is not clear and so I cannot tell if the fertilizer is being dispensed. There have been times when it has not as I can see it when draining it out at the end of each use. I discovered that insects and spiders were entering the backflow preventer and clogging the orifices in the injector. Wrapping some Scotchbrite (tm) around the backflow preventer stopped this. All in all the Chapin 4700 seems to be a nice fertilizer injector and will be a welcome addition to our irrigation system as it gradually evolves.
                      by
                      • Recommended
                      1 found this review helpful
                      Showing 1-10 of 121 reviews

                      Compare Key Features

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                      Product Snapshot

                      Ideal for customers who want precise, automatic fertilizer mixing, ensuring a lush, well-fed landscape.
                      Ideal for customers who want rapid root development, ensuring successful plant propagation.
                      Ideal for all plants, this all-season plant food boosts growth, enhances nutrient uptake, and increases stress resilience.
                      Ideal for dedicated home growers, ensuring stronger plants and better yields.

                      Nutrient Composition

                      0-0-0 N-P-K ratio
                      0-0-0 N-P-K ratio
                      3-0.6-0.6
                      1-3-1

                      Formulation Type

                      Liquid concentrate
                      Thick gel formula
                      Liquid Concentrate
                      Liquid concentrate

                      Application Frequency

                      Not specified

                      Plant Type Specificity

                      Enhanced Micronutrients