Lanthanum Chloride (Phosfree) dilution help - (Maths are hard)

[WVNed]

I 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!

if 500ml will drop 300ppb in 10,000 gallons

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

 

[skyrne_isk]

if 500ml will drop 300ppb in 10,000 gallons

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

Thanks so much for confirming my calcs! Stoichiometry was never my strong suit.

 

[WVNed]

Mine either. My son the engineer checked my math.

I use this dose calculator. It seems the stuff you have is not as strong as what I use. It is first diluted by 2/3
before dosing..
Two Little Fishies PhosBan®-L IMPORTANT: First dilute PhosBan®-L by mixing 100ml of PhosBan®-L with 200ml of reverse osmosis or deionized water To reduce phosphates from 0.1 ppm to 0 ppm in 100 gallons of water: PhosBan®-L dose: 2.5 ml of diluted solution
http://larryl.emailplus.org.user.fm/fish/dosing-instructions-phosphate-removers.html

I made 3000ml and put it in the doser last night. Time to buy another gallon.

So in the calculator you can use the section for diluted PhosBan-L