The calculation is pretty close, w/f is by volume only. Water is 25% heavier than fuel. so at present you are injecting between 12.5 to 18% mass. Not really a problem.
My concern would be your water pressure, if you could get teh 100psi pumpm it will be much better and don't have to worry about differential pressure loss.
Not shure if the pump's pressure governed by the pressure switch.
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Richard L
aquamist technical support
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