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I've been looks at the ratios and percents of Ca, Mg and K in the readily available GH boosters and none of the chemistry/math is lining up. I have both NilocG's and GLA's GH booster salts (and I've used seachem equilibrium in the past).
NilocG's is the only one that states a ratio for the mixture, 1:3:3, MgSO4:CaSO4:K2SO4.
NIlocG also has the same % analysis as GLA's at: 9.64% Ca, 1.42% Mg, 22.3% K2O.

I must be doing something wrong or starting with the wrong units... The claimed 1:3:3 ratio is by mass right?

Let me know if you can get the percents and the ratio to make sense, I couldn't.


GH Booster | NilocG Aquatics
https://greenleafaquariums.com/aquarium-fertilizers-supplements/gh-booster.html
https://www.seachem.com/equilibrium.php
 

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cool! I understand KHCO3 and K2SO4 have different molar mass per K, to get the same amount of pottassium, how much KHCO3 should I be adding instead of K2SO4?

thanks
Woah woah woah, you don't want to be adding that much kH, 1.0 is enough.

135mg / 1 gallon = 1.0 degrees of kH = 14ppm of K.

The rest of the K can come from KNO3 / KH2PO4 and if need be K2SO4. Really depends on the levels you're after.
 

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@Vinster8108 and @Here_To_Learn:

Life has been made easier for us. Just go here: Rotala Butterfly | Planted Aquarium Nutrient Dosing Calculator and plug your numbers in. The amount of any aspect of the Mg, Ca and K can be viewed in terms of PPM and how much to add. no need to use any math (unless you like the exercise).

Like @Quagulator, I use KHCO3, but only to set my KH value at 1 dKH. The K tags along for the ride. If more K is needed, i then add the necessary K2SO4. All of this can be seen on the above website, as well.
 
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