What's the rationale for the $400 Dosatron over the $40 Mazzei? Is it that you can control the strength of the mixture more easily? Do Dosatrons work at a wider range of flow rates? Mazzei injectors are cheap, but they only work within a narrow range of flow rate.
With my drip tape, my high tunnel is 1.5 GPM when just only it is being irrigated, but when I turn on everything, it is 9 GPM. I still haven't found an injector that will work at both of those rates.
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