Tom, should we be concerned with tech bulletin #2 for any reason,
Mazzei Injector Corp. - Technical Bulletins
This was the response I got from Mazzei,
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This pump is below our testing point of 5 psi of inlet pressure. Depending on you backpressure, which I'm assuming is low if you have the 287 working at 2 psi inlet pressure, you could possibly use a 584. Because this is below our testing points I can not tell you where exactly this will work but somewhere around 400 l/hr at 200-250 mbar is my assumption. You can get this model in either 3/4" (584) or 1/2" (584-C). If you have any questions, please do not hesitate to contact me.
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The thing with having the mazzei close to the cannister filter is that 1' of head pressure (pressure from gravity pulling on water) is a lot for the injector. It works, but it works better the higher up you install the injector. Basically we are aiming for 0 pressure on the outlet of the injector, and a lot of pressure on the inlet (water going into the injector).
You can give the pumps a try. From my experience they are not engineered to deal with the backpressure. Here are my older post,
DIY In-Line Micro-bubbler - Page 6 - The Planted Tank Forum
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Also, it seems the pump driving the venturi is a big variable in all of this since the stronger the pump, the more pressure on the inlet side. Is this more of a trial and error process or is there a BKM (best known method) established?
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The thing is some pumps are engineer in a way that they can't deal with back pressure. They could have a flow rate of 1000gpm, but you add a restriction, and the impeller doesn't move any water.