Wasser this is a copy and paste from Greg's site:
PMDD premix contains:
1 part Potassium Nitrate,
1 part Potassium Sulfate,
1 part Magnesium Sulfate, and
1 part Plantex CSM+B.
Shalu is right, no PO4. Sarah you could certainly try dosing a Fleet enema (unless you have another readily available source) for the rest of the week and see if that helps. Using the EI method, I dose 2mL, 1mL, 1mL ie 4mL per week. If you want to see the math
I have posted it in the past.
Interesting Shalu I did not know that low PO4 caused low nitrate uptake. Now you can see the potential dilemna in using the premix. Sarah cannot cut back on her nitrates without cutting back on the traces. But if it makes life easier for her, and it works...
The other thing this brings to light: I am not dosing nearly as much magnesium as this 1:1:1:1 ratio would dictate. I wonder if some of my stunted growth lately may be due to Mg deficiency. I am keeping an eye on my tank and BSS's thread.
Let us know how it works out.