Some people have problems with nitrates and if the 2 bottle system is purchased you can't remove the KNO3 from your solution.
1 dry packet per bottle.
If the dry separate products are purchased a nitrate free bottle can be created.
NilocG is a member here and sells the products.
He is very helpful to many members I have seen on here.
If you wish you can duplicate the Seachem line but it can be reduced to two bottles.
I would suggest 3 bottles if nitrates due to fish load is high.
Bottle 1 all macro's minus the KNO3.
Bottle 2 replicate the Seachem nitrogen product.
Bottle 3 all micro's add iron if desired.
Dose bottle 2 only when needed.
How are the nitrate levels in your aquarium?
That would be a determining factor in your decision.
Suggesting this only because of so many threads are related to high NO3 and dosing is usually involved.
This site https://sites.google.com/site/aquati...ts-and-testing
has a wealth of information.