Dosing question

[jduck]

adflution and then dose that?

 

[Randy Holmes-Farley]

There are several forms of sodium phosphate and potassium phosphate, with different percentages phosphate.

Is it trisodium (or potassium) phosphate? Na3PO4 and K3PO4?

 

[jduck]

Monobasic sodium phosphate, NaH2PO4.

Mono potassium phosphate 0-52-34

 

[Randy Holmes-Farley]

NaH2PO4 is 79% phospathe by weight.
KH2PO4 is 70% phosphate by weight.

1.0 ppm phosphate = 1.0 mg/L (actually, 1.0264, but rounding gives 1.0)

1 mg/L in 100 gallons (378.5 L) = 378.5 mg of phosphate needed

Since the NaH2PO4 is 79% phosphate, we need to add 378.5 mg/0.79 = 479 mg or 0.48 grams