I made the bypass. I just walk into the hardware store and envision what I need. No list. That particular one I made of all 1/2 pvc. So, one would need 1/2 pvc pipe, a ball valve, two T couplings, two slip x male threaded elbows, and two female threaded unions. Plus primer and glue. To fit mine to a hose, I needed a 1 male and 1 female hose connecter to pvc adapters. Just make sure that one of the last pieces in place is a section of pipe from a T to the ball valve. In other words, put the injector in place, and then determine the length of the final piece of pipe between the ball valve an a T. The blue one in the photo I posted above was 1/2 inch, identical to the one you provided a link to. Significantly larger than the smallest mazzei. The best price I was able to find on mazzie injectors was the source they linked to on their site. Kisko Sales Playing with the 283 Saturday, I started to time how many gpm flowed through it, and how much it would take up, but someone decided to start a shower in the middle of filling a 5 gal bucket, so the flow rate changed with the pressure change. I didn't have time to start over and move everything over to the secondary irrigation source. But I did note that the flow exiting my hose may have been less than 1 gpm, and the suction rate was very high. Much higher than I expected. Emptied 1/2 gallon in a min or two. As I mentioned above, I definitely need the bypass to slow down the uptake rate, and provide reasonable flow for a hose end shower sprayer. Late Sat I was able to get it all setup with diluted sulfuric acid, dial in the bypass, and now my water coming out of the hose is a pH of 5. Perfect for the blueberries I need all this for. You only need the cheaper poly propylene. I got one PP and one NPVDF. I will use the NPVDF when I setup the acid on an automated irrigation system, not this portable hose setup where I am using more dilute sulfuric acid. I donâÂÂt know that I need the NPVDF, but it does have higher chemical resistance and heat resistance, so when IâÂÂm using more concentrated acid in the irrigation setup, I wanted the more durable NPVDF to last longer. The mazzie salesman I spoke with convinced me there may be enough heat creation with concentrated acid injection that the NPVDF was a worth considering. For fertilizer, PP is more than adequate.

mangledmind - I wasn't aware I had "ripped" anyone. My apologies if it seems I have. Nor is providing the specific name of a product - since the OP always asks for such info - out of line. I have no vested interest in either of the products I mentioned other than that I like the results from both and they have been recommended by several other regulars here as well but I pointed out that many others are available. I do however disagree with this statement the only way to fertilize without "chemicals" is with compost ("mature" manure, veggie compost, compost teas, etc.) and this one, compost tea is the same darn stuff they sell folks as 'liquid organic fertilizers' for tons of money that is unnecessary as it can be made at home for pennies. First there are many other ways to fertilize without chemicals and second I don't dispute that compost tea is an excellent source of nutrients and I make and use it by the barrel. But since I do not have access to all of the various ingredients that go into many of the commercial organic supplements - all good sources of important micro-nutrients - such as seaweed, kelp, bat guano, coconut oil, etc. - there is no way my or any one else's homemade compost tea is the same as those supplements. Not better or worse - just not the same. And, compost tea only works for fertigation after it is carefully and repeatedly strained to remove any particles that can plug the system. The commercial products are already well refined and ready to use. Whether the reader chooses to use just compost/manure tea or a commercial product or a mixture of both is their choice but it doesn't hurt to provide info on all the options available. Dave

I've used the siphon fertilizer injection tank from dripworks.com for years on my drip irrigation system. They work great, in fact I just purchased a third system for my new greenhouse irrigation. They have several sizes, and I believe mine is about 3/4-gallon.

fm, Thank you for providing that info. The info was very complete. It also serves to illustrate that you can take a simple process of fertilizing your lawn by hand and turn it into a complicated and costly process with any number of parts that can have problems and make it difficult to discern was fertilizer rate you are applying to the plants. Also over time will clog your drip irrigation system with precipitated salts. JMHO Aloha