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"The Estimative Index" selection is for classic EI dosing which is macros and micros on alternating days i.e...

Mon Macros
Tues Micros
Wed Macros
Thurs Micros
Fri Macros
Sat Micros
Sun 50% water change (no dosing except for GH alterations)

Typical macros and micros are...
Macros = KNO3 & KH2PO4
Micros = Plantex CSM + B

EI Daily is simply dosing everyday

There's generally enough potassium (K) in the KNO3 and KH2PO4. If you crunch the numbers,
A Full EI dose of K is 7.5ppm.
KNO3 & KH2PO4 adds 5.27ppm
This leaves a deficit of only 2.23ppm of K.

That's a weekly deficit (if you want full EI dose) of 6.69ppm of K.

One teaspoon of Seachem Equilibrium provides 6.10 ppm of K which would account for the extra K needed. I would assume you are adding more than this to reconstitute your R/O anyway. Make sense?
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