Add-It fertilizer injector with vacuum breaker, pint capacity, 3/4" FHT x MHT inlet/outlet

Had I known this I would not have needed a replacement.. Here is my feedback to customer service (very responsive and nice by the way):Thank you for sending a replacement .. the replacement works great because I made some modifications to the in-line fertilizer. You can hopefully make these modifications to the in-line fertilizer; i think you will find these are safe changes to have in all cases.There were two problems introduced by using products available at Home Depot with the in-line fertilizer:The first is a short-hose from Home Depot. It is not only short in length but short in the female connector. At least one brand of short-hose at my Home Depot has a female connector that is approx 1/2 the width of most female host connectors. The mail end of the in-line fertilizer product has about 3mm of out-facing unthreaded plastic. Because the metal female hose connector was not as wide as most, only the first part of the in-line fertilizer threads were used in the connection before the in-line fertilizer's plastic started touching the gasket in the hose. Since there were not enough of the threading involved to hold the hose on, the plastic threads on your product stripped as the hose was tightened. The fix was to (after I got your replacement) hack-saw (about 3MM) off the dead plastic leaving the male connector of your product threaded all the way town to the end of the connector. The hack-sawing was very easy - just start slow then it cuts like butter. I did a bit of sanding to make sure it was flat as that needs to press against a rubber washer to seal. It seals great now.The second problem is the same thing except on the female side. The problem is introduced with the Home Depot brass 2 way splitter. The splitter has a leaver that cuts off the water. The lever interferer with the female coupler on the in-line fertilizer. I removed about 3mm from the female side of the fertilizer; although I really only needed to remove 1mm. There are plenty of threads left to more than cover the brass threads. After the required hack-sawing that end fits perfectly too.

This is very difficult to set up and use correctly and it wastes a lot of fertilizer. I bought four of them for various places around my property and am really regretting wasting over $100.1. My hose bibs all angle down so the feeder cannot be connected as directed, with the in/out horizontal and the tube vertical. In fact, the tube is too long to fit at an angle - it hits the side of the house. I connected one with a feeder hose, made a huge contraption to support it properly that cost $$ and looks like crap, but the injector is set up correctly with the tube hanging vertically. I don't know what I'll do for the other side of the house since that arrangement is not possible.2. Filling the injector is difficult and wastes a lot of fertilizer. Do this: make sure the backflow valve is attached to the intake side and put a hose cap on the outflow side (unscrew your hose to do this, otherwise your hose will fill with undiluted fertilizer). Do not bother with the funnel that comes with it. Pour the fertilizer (must be liquid) VERY SLOWLY into the top filler. If you pour too fast it will run back out the top. If you do not cap the intake and outflow it just pours out those. This process will take several minutes and you will waste about 1/3 of your fertilizer, so be careful what is below you when you are doing this.3. The top cap leaks pretty significantly when you turn on the hose, so you will lose more fertilizer that way. You also will be watering and feeding the weeds that grow below your hose bib.4. There are flow rate charts on their website but that really doesn't help you know how much you use when you are watering container plants, starting and stopping the water flow. So how do you know if all the plants got fed or when to refill the thing?5. The instructions say to not install this in the sun. Really? I can't think of any place outside my house that does not have sun on it at some point during the day. Hoses are made to handle some sun exposure. Couldn't this have been made to do that too?

I've been looking for something like this for years. First off, it works. Unlike other reviewers, mine was actually hose pipe threads on both ends. No trouble filling if you use the funnel. There's a pinhole in the top of the pass-through you see looking down into the fill cap. If you don't use the funnel, or tilt the funnel forward and rest the nozzle over the pass-through, it will leak out of the backflow valve supplied with the unit. I guess that's what people are complaining about when they say it's hard to fill. It's not if you understand how it works. The only complaint I have is that I didn't opt for a larger unit. This thing empties in 15 gallons which for me is about 5 minutes of watering through my drip system. Also this makes the delivery an approximate 1oz of fertilizer to 1 gallon of water mixture. This is the recommended dosage for my fish and seaweed fertilizer, however the instructions say to dilute it 1:1 with water before filling the unit. This drops it to 1/2oz per gallon that I'm actually applying making it a weaker application so I have to feed and fill the container twice. I'll end up buying a larger unit from this company down the road. The customer service at the point of sale is impeccable. It includes great instructions, a "thank you" note, an actual business card, and a pack of jelly beans which was a nice touch! Highly recommend this company.