Phosphat-E Dosing Calculations

[TCoach]

So, wanted to get a quick check on my logic to help me with dosing Britewells Phosphat-E.

The instructions say that 1ml removes 1ppm in 4 gallons of water or .25ml/gallon => 1ppm drop

My doser (Jebao 2.4 wifi) can only dose in whole ml so I dilute my Phosphat-E by 3 (500ml Phosphat-E bottle into 1000ml rodi for a 1500ml solution at 1/3 potency).

Tank is 120 gallon and with the sump, I'm using that as the total water volume.

So if I dose 1ml/hr every hour I should expect:
Total product dosed: 8 ml (24 * 1/3 from dilution)
Phosphate-E needed to drop 1 ppm: 120 gallons * .25ml/gallon -> 30 ml
So expected drop/absorption of 8ml Phosphat-E into 120 gallons of water -> 8ml/30ml => 0.267 ppm

Does that look correct?

Thanks,
-Chris

 

[Jekyl]

120g with sump isn't your total volume. You have displacement from rocks, sand, etc..

 

[Pistondog]

A better method would be to dilute 10ml phosphate e, 50 or 100:1 and drip into overflow over 5 or 6 hours, caught by 5 micron sox.
You do not want unreacted lanthanum in dt, so do not use when po4 < 0.2 ppm.
use of lc has killed tangs.

 

[TCoach]

I’ll be dosing it into my skimmer. Best way to do it since filter socks clog to quickly.

 

[Pistondog]

You are correct, i sometimes have to change the sox once after 4 hours. when doing this task, every 2 months or so.
Happy to do it as this is my perceived best method to keep livestock safe.

 

[Randy Holmes-Farley]

I’ll be dosing it into my skimmer. Best way to do it since filter socks clog to quickly.

Do you know that skimmers remove all the particles?

 

[TCoach]

Do you know that skimmers remove all the particles?

Sorry, should have said: "For me, dosing in the skimmer ..."

 

[Troylee]

I havent used it in a long time but I always poured it into my overflow myself..

 

[jda]

I don't know about the math. It won't work out that way because you cannot predict or even estimate how much po4 will unbind from the sand or rocks when you remove some from the water column.

Your skimmer will not get all of the flocculant. Guaranteed. Is this enough to matter? Nobody knows. You can just put socks on, dose down the overflow and take them back off. You can also run a maxi-jet with a hose into a sock attached to the top of the tank with a clamp and dose into the sock... then take it back off.

You want to remove po4, but not have your tank level go down and up like a EKG. You want to remove at about the same rate that the rock and sand unbind. Basically, a small net loss the next day on the test kit... like 0.01 would be about right. These can be within the testing errors of most kits so you have to have some faith and all.