CHAPINInternational Chapin 4710 HydroFeed 1-Gallon in-Line Auto-Mix Fertilizer Injector Sy, 1 Gallon, Translucent

It worked quite well in delivering the fertilizer to the irrigation, but then developed a crack and as a result leaked. Customer service resolved it right away. Now up and running no prob.I suggest isolating it from your main irrigation line with a diverter and valves - only allow water flow through it when you want to fertilizer. Will likely extend the life.

I use the inline fertigator with a timer and drip lines. Worked great for my needs. I keep it covered away from direct sun (it is plastic after all). Was very easy to use. I was fertilizing my plants once a week and they did very well. I did not have an issue with the adjustment knob. I saw a couple of comments about not knowing exactly how much fertilizer solution (from tank) was mixed with irrigation water. Could that be done? Probably yes. Was I interested in knowing? Definitely no. If you think that one scoop of dry fertilizer in the gallon is not enough or too much, adjust next time. The mix I was using produces a pink color in solution. After I irrigate my plants once for 60 min, solution turn clear (so fertilizer was used). Happy with the purchase.1 year update:The tank started leaking bad this season. It seems like the leak is coming from the seam. The tank shell is made of two halves with a seam in between, and that's where the problem is. I am not sure how much of the fertilizer is making it to the plants. Very unhappy with the low quality. I took out 3 stars from my initial review. Tried to seal with 2 part epoxy and that didn't seem to help.Tried again to salvage the tank. The leak did not seem to be due to tank cracking, but the rubber seal not doing its job. I bought a few different sizes of rubber o-ring material, cut it to length and super glue it. That made a nice O-ring, but the unit still leaks. Frustrating to waste that much money for a unit that should contain water but does not because of poor workmanship. This product should be taken off market. Kept one star, yet wished I can give it -5. Garbage, will not trust that brand ever again.

It worked well at first but shortly after using it for a bit, a leak appeared around the collar from the plastic meld line. I managed to patch it up with flex seal/tape only to have the major weld around the base spring a huge leak. Unfortunately, that was unrepairable and it met its end.

I bought the one gallon injector and there was no amount of tightening the top that would stop the solution from pouring out the top of the container. I read other people's reviews and learned that some people had the same issue. I called Chapin with my issue and a nice woman said they would send me another injector and I did not need to return the defective one. I wasn't given any shipment tracking information at that time, so I called back eight days later to check on the status. My new injector was to arrive that very day. I think I was speaking to the same lady and this time she suggested putting Vaseline on the O ring of my first injector. I have not tried the Vaseline because my replacement injector works great without a single leak! The clear cupped part (that has the O ring) definitely fits more snuggly than the first injector. One tip would be to not get any fertilizer on concrete. I have ugly stains down my drive way now from the first unit leaking.

It might be better than nothing but not a lot.