Dosing phosphate - NaH2PO4 or HNa2O4P?

[giangnambui]

Hi randy,

i have a question for Nah2po4. So I wonder how is the maximum PPM of Po4 adding to the tank per day (i.e alkanity I do not add over 1dkh/day so it is the same to the Po4).

Thanks a lot.

 

[Randy Holmes-Farley Verified Community Expert]

Hi randy,

i have a question for Nah2po4. So I wonder how is the maximum PPM of Po4 adding to the tank per day (i.e alkanity I do not add over 1dkh/day so it is the same to the Po4).

Thanks a lot.

I think that particular product would actually tend to cause a tiny alk drop each day, but really tiny (for a dose like 0.03 ppm phosphate per day). I would not worry about it.

 

[kblazewicz]

The only differences are very minor adjustments to alkalinity. Na3PO4 will very slightly raise it. Na2HPO4 is about neutral, and NaH2PO4 will very slightly lower it.

Hi Randy,

isn't H2PO4- the phosphate ion form neutral to alkalinity?

reference: https://en.wikipedia.org/wiki/Alkalinity#Simplified_summary