if 500ml will drop 300ppb in 10,000 gallonsI am trying to figure out an appropriate dilution for Phosfree for my tank. The MSDS indicates it is straight lanthanum chloride, and the dosing instructions indicate the scale of application is at the absolute other end of the continuum relative to what my tank would need. The back of the bottle (pictured below) says that 500mL would drop 300ppb of phosphate in 10,000 gallons of water.
My tank is 150G of actual water volume and has been measuring 0.10ppm or so on Hanna ULR.
So adjustment factor “V” for the volume of water differences:
V: 150G / 10,000G = 0.015
And adjustment factor “C” for for relative concentration differences (and 0.1ppm = 100ppb)
C: 0.10ppm / 300ppb = 0.333
Dosage adjustment that would theoretically take my tank to zero…
V * C * Recommended Dose
= 0.015 * 0.333 * 500 mL
= 2.5 mL
Does this check out right to you guys? Would probably dose half that amount and see what happens if someone can double check me.
Thanks!
divide by 100
5ml will drop 300ppb in 100 gallons
or
5ml will drop 0.3ppm in 100 gallons
5ml/0.3ppm = xml/0.1ppm
xml = 5x0.1/0.3
= 1.67 ml will drop 0.1ppm in 100 gallons
x 1.5 for 150 gallons = 2.5ml