I took my hand held one and bored out the orifice to 0.040 and use Alaska fish fertilizer 5-1-1 in it.
I did some calculations and testing.
With the bottle 1/2 full of the fertilizer and 1/2 full of water mixed I get 1 1/2 tablespoons per gallon coming out of it.
One thing these MG folks dont tell you is these contraptions get clogged up with salt and stop working.
It is easy to take them apart to clean but a better option would be to put fresh water in one of the bottles and flush the system out.
Worth
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