LQ Industrial 3/4Inch Black Irrigation Venturi Fertilizer Injector Agriculture Irrigation Device Tool

Works well.

I used this to create a nice venturi loop on the return line to my cold plunge. It is perfection. Check out my build in the picture. You have to put a little ball valve in the loop so you can get the right amount of vacuum to pull the air into the return. This is a simple loop that I can move to any other setup I go with. Just make sure you put it on the return line so you don't put air all in your pump.

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So I saw several reviews that the product doesn’t work, I thought that as well but was determined to make it work. Here are some tips, 1. will not work with an impact style sprinkler or dip system, 2. ensure all fittings are leak free ( use thread tape on screw connections. It’s not the pressure that’s important, it’s the flow, once I figured this out it works flawlessly. I’d say it injects about a half gallon a minute at full choke. Of course you’ll have to build a pvc manifold to control injection rate.

After reading all of the reviews I went ahead and bought the injector knowing that I could make it work. You must keep in mind that the venturi works off of differential pressure and you must install two pressure gauges (one on each side of the venturi) to be able to measure determine the best diff pressure to use for your application. Here are my calculations to set up the venturi...My container vegetable garden utilizes about 23.75 gallons per minute at approx. 15 PSI and consists (all of which are considered "drip irrigation") of:-48 ea. Flag Drippers at 0.016 GPM (1 GPH) ea.-300 ea. Orange Spot Spitters at 0.06 GPM (3.6 GPH) ea.-36 ea. Mini Sprays at 0.1 GPM (6 GPH) ea.-24 ea. Bubblers at 0.016 GPM (1 GPH) ea.First off, you must realize that the threads on the device are BPS (British Pipe) and NOT NPT. British Pipe threads are cut at an entirely different angle and are NOT tapered. It just so happens that the BPS and NPT pipe threads have the same "pitch" (14 threads per inch). I was able to utilize two PVC 90 degree elbows (slip x 3/4" FNPT) with copious teflon tape to secure a watertight seal. I threaded the elbows all the way down (tough going) until they bottomed out at the venturi boss. I'm sure that the poly venturi threads pressure "conformed" to the harder PVC threads.I drilled and tapped two 3/4" PVC caps to accept the 1/4 NPT threads on the gauges. Although the caps are not very "thick" where the threads are, the gauges tightened securely and I doubt that they will fail at the limited pressures (35 PSI max) that my centrifugal irrigation pump puts out.Please see the photos for more info on the installation. I cut it into my existing line used for the container garden. The photos show:- No pressure in line (line valve closed)- Line in use without injector participation (line valve open, injector valve fully open)- Line in use, injector just starting to create suction at about 4 PSI diff pressure (line valve open, injector valve adjusted slightly closed)- Line in use, injector drawing fluid from container (line valve open, injector valve closed a little further)- Close up of the setup with both valves completely open (bypassing the injector)- Photo of distribution pipingA couple of photos of the container vegetable garden are also included as reference.Testing on my system indicates that the suction begins at about 4 PSI of differential pressure (22 PSI inlet and 18 PSI outlet) Suction then varies proportionally all the way up to (hard to measure) 25 PSI of differential pressure (30 PSI inlet to 5 PSI outlet). At full suction, I can empty one quart in 15 seconds (1 GPM). At 15 PSI output (which is what I need to adequately run the system) I can inject approx. 3 gallons per hour which is perfect, seeing that I only run the system for about 20 minutes at a time.Overall, this injector was easy to set up, exhibits a flow range perfect for my application, will ease the burden of hand fertilizing all of those containers (it was a pain the last few seasons), and allow me to better tune the nutrients that the garden receives.Very happy with the product and will probably duplicate the set up for the nursery and the butterfly garden!Remember you MUST be able to control the differential pressure and SHOULD be able to monitor it using two gauges.

If you run it without any hoses attached in front of it, it will work. But, I bought it to apply fertilizers for my summer garden. The garden has a drip irrigation setup. I would have given the review -5 stars if I could. Cheap, and does not work for the intended application. There is no information what so ever for how it is supposed to be used, except for a few images. In one, they show a setup for how it is supposed to be hooked up but was useless. I used PVC bypass 3/4 inch with three valves and no matter how I I try to adjust those valve there is no suction. I don't have a picture of the finished product but just to give you an idea I put up a photo. The injector will not work with drip irrigation unless you have a huge outflow. The issue is that any water pressure in front of the injector prevents it from working. Again, documentation for what you should expect would ave made me not buy.

It would be much more helpful if this came with instructions & troubleshooting. I finally through many Google searches & testing different ways finally made it work

Connected to my garden impact sprinkler. Apparently the flow was either too low or the pressure was too high. It drew when purging the air but quit after it came to pressure. I was not able to use it. The only time I could get it to work was without a hose attached to it.