Randy Holmes-Farley
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My Tank Thread
1ml of neophos will raise 1 gallon of water to 1.2ppm phosphate. So 1ml in 16 gallons would yield .075 so I cut that down to .5ml and should result in .03ish phosphate. Please check my math though.
Aiming for .03ppm phosphate not .7ppm
Such a calculation will be nearly worthless, except as a crude starting point. You might need more than 10x that amount to get to your desired level since so much will bind to rock and sand.
Brightwell doesn't put the directions on the web site so I cannot confirm that dose.

