PO4 Dosing Calculator?

[JGT]

Hi, is there a calculator that can help figure out how much PO4 to dose? Thanks.

 

[Justdrew]

http://www.theplantedtank.co.uk/calculator.htm
Here’s the calculator most point to for figuring out dosages.

 

[JGT]

http://www.theplantedtank.co.uk/calculator.htm
Here’s the calculator most point to for figuring out dosages.

Great, thanks!

 

[JGT]

And if I’m using food grade trisodium phosphate which of the phosphates do I select?

 

[Justdrew]

And if I’m using food grade trisodium phosphate which of the phosphates do I select?

I’ll defer on that one as there are potency factors involved for items not listed.

 

[Mike konesky]

Select phosphate using potassium phosphate. I forget the % conversion though. I wanna say use 30% more tsp, but let's get a pro. @taricha can you help?

 

[A_Blind_Reefer]

I believe that i saw a post awhile back where Randy had mentioned that the % difference is so minute that it’s insignificant in the grand scheme of things. I use the calculator with sodium phosphate dibasic and it’s a good starting point. It’s not exact, so start lower and work your way up slowly.

edit. I guess I should add that I base that off making a solution to increase phosphate at 1ml to 0.01ppm.

 

[JGT]

Select phosphate using potassium phosphate. I forget the % conversion though. I wanna say use 30% more tsp, but let's get a pro. @taricha can you help?

OK, that’s the one I figured. Didn’t realize the uptick was required though. Will see if taricha chimes in. Thanks.

 

[JGT]

I believe that i saw a post awhile back where Randy had mentioned that the % difference is so minute that it’s insignificant in the grand scheme of things. I use the calculator with sodium phosphate dibasic and it’s a good starting point. It’s not exact, so start lower and work your way up slowly.

edit. I guess I should add that I base that off making a solution to increase phosphate at 1ml to 0.01ppm.

Strange, I don’t see sodium phosphate dibasic listed.

 

[Mike konesky]

Tank size? Might be able to help more.

 

[JGT]

Tank size? Might be able to help more.

240 plus 45 gallon sump. I think with live rock displacement it’s around 250 total gallons.

 

[Mike konesky]

Peeeerfect. Loudwolf tsp solution: 2tsp/1gal
5ml of solution will raise phosphate by .01

 

[JGT]

That’s the exact TSP I ordered. If I put it into the calculator though the math doesn’t jive. It says I would need 10 tsp/gal to get 0.1 increase.

 

[JGT]

Tried tablespoons and that worked. Did u mean table vs. tea?

 

[Mike konesky]

Teaspoons

 

[Mike konesky]

Here's what I'm seeing

 

[JGT]

Teaspoons

Ah I see what I did wrong. I didn’t change the 1ml to 5 ml in the calc where it asks for how much solution to add.

 

[JGT]

Ah I see what I did wrong. I didn’t change the 1ml to 5 ml in the calc where it asks for how much solution to add.

And this implies no uptick. You mentioned something earlier about a 30 % uptick. Is this still the case?
How often should this be added to the tank?

 

[Mike konesky]

It's gotta be +30% tsp compared to potassium phosphate. If you change the 5 to a 50 you will see the extra from the conversion. Glad you had a 250, as my calculations are for a 125. How much you add will depend on your systems. My 125 gets .16 worth a day, 300 gets .18 worth.

 

[A_Blind_Reefer]

Strange, I don’t see sodium phosphate dibasic listed.

It’s not. I meant to follow the potassium phosphate calculator. I believe the difference is miniscule. I used it as a starting point as I use sodium phosphate dibasic with that calculator.